Download Trane Direct Fired Make-Up Air Catalogue

Product Catalog
Direct-Fired Make-Up
Air Units
DFIA
DFOA
November 2009
MUA-PRC007-EN
Introduction
Why use Trane Makeup Air Units…
Trane’s innovative Direct Fired gas heating systems add warm, fresh and clean air to your work
environment for about 20 precent less than the operation and maintenance costs of indirect gas
heat.
•
Heats Without Complications: The Direct Fired gas heating system heats efficiently and costeffectively using no heat exchanger.
•
Replaces Indoor Air: The Direct Fired gas heating system replaces indoor air that can become
chemical laden in an industrial process or commercial cooling application.
•
Provides Ventilation: Fresh air is available simply by turning off the heating section.
•
Cleans and Tempers Incoming Air: The optional filter bank removes airborne particles, and
cleaned air is heated to create a more refreshing and comfortable indoor environment.
•
Trane offers two styles of Direct Fired gas heating systems:
– Indoor units (DFIA)
– Large outdoor units (DFOA)
What Is Make-Up Air?
Make-up air is an outside air supply that is brought in to relieve “air starvation.” Without make-up
air, a building is under a “negative” condition and the following will occur:
•
Backdrafts in natural flues, ventilators and stacks.
•
Reduced air volume handled by the exhaust fans and subsequently inadequate removal of
contaminants.
•
Dispersal of contaminants throughout the work area by high velocity cross-currents from
uncontrolled outside air sources.
•
Uncomfortable and unhealthy working conditions.
•
Pilot outages.
When Is It Required?
Make-up air is required whenever exhaust fans are used. This need for a building “air change”
arises when there are:
•
Processes which generate contaminants in the form of noxious fumes or dust.
•
Activities which create excessive heat or undesirable odors.
•
Hazardous material storage areas.
•
Ventilation requirements for a building’s inhabitants.
•
State and local code requirements.
Why Use Make-Up Air Units?
Outside air should not be allowed to drift in through windows, door cracks and other openings,
creating a strain on the heating system. Outside air should be controlled, tempered and
coordinated with the exhaust by a make-up air unit. The latter is reliable, efficient and does not
disrupt building activities.
Why Use Direct Gas-Firing?
Maximum economy is realized with direct gas-firing because the incoming air is heated directly in
the burner chamber. This provides 100 percent efficiency (92 percent sensible, 8 percent latent)
while eliminating a heat exchanger or combustion chamber that could burn out or corrode.
Trane direct-fired units are factory tested, include the necessary controls for operating the system
and generally cost less than alternate systems.
© 2009 Trane All rights reserved
MUA-PRC007-EN
Introduction
Installation is simple since the unit, (when shipping permits), is shipped as a complete package.
The burner is fully modulating, with a minimum firing rate of four percent of full input. This
characteristic results in just the right amount of heat under all operating conditions.
Industry Approval
ETL Labeling Requirements
A DFOA/DFIA unit can bear the ETL label if:
•
The unit airflow is within the SCFM range shown in Table 3, p. 18 (DFIA) and Table 12, p. 33
(DFOA).
•
The fuel is natural gas with a temperature rise not greater than 130°F or the fuel is LP and the
temperature rise not greater than 100°F.
•
The motor is a single speed motor, or if the motor is a two speed motor, the burner will operate
in only one of the two speeds (high or low speed).
•
Unit components are standard (there are exceptions to this).
•
If the unit has return air, the unit must have a mixing box with the AdaptAire airflow station.
Maximum Emission Levels:
•
If the unit has an ETL label, the maximum levels of the products of combustion meet
ANSI Z83.18 which are:
•
Carbon Dioxide 4000 ppm
•
Carbon Monoxide 5 ppm
•
Aliphatic Aldehydes 1 ppm
•
Nitrogen Dioxide 0.50 ppm
CETL Labeling Requirements (Canada)
A DFOA/DFIA unit will have a CETL label if the unit meets the first five items of “ETL Labeling
Requirements” (above), AND the unit does not have return air.
Trademarks
Trane and the Trane logo are trademarks of Trane in the United States and other countries. All
trademarks referenced in this document are the trademarks of their respective owners.
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3
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Application Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
The Need for Make-Up Air Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Outdoor Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
What Fuel to Use? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Burner Selection Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Horizontal Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Vertical Configurations (DFOA only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Vertical Configurations (DFIA only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
DFIA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reliable Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Equipment Approval Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Special Construction Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DFOA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Model Number Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Features and Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Basic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Gas-Fired Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Electrical Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Motorized 75/25 Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Mixing Box—Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Mixing Box—Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Mixing Box—Building Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Motorized Inlet Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Exhaust Interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
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UV Flame Sensor (UV Mini-Peeper) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Optional Gas Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Factory Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Additional Options* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Additional Factory Installed Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Field Installed Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
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Application Considerations
The Need for Make-Up Air Units
When more air is exhausted from a building than is supplied by the mechanical systems, the
building is under a “negative” condition. Air will leak into the building through cracks, windows,
and doors.
•
Make-up air units are typically used to compensate for air being exhausted from a building or
other structure.
•
Application for closed systems such as ovens or paint booths (consult home office).
•
For use as a door heater where outside air is heated and not prevented from infiltrating.
•
The DFOA/DFIA can be used as an air handler, no burner section. Can also be used with DX,
electric, CW, HW and steam coils. Contact your Trane representative.
Figure 1. Application and various modular arrangements (DFIA only)
Outdoor Units
Outdoor make-up air units are the most common approach to relieving negative pressure inside
commercial and industrial facilities. All units offer the advantage of a full support system that is
watertight, provides a plenum for return air, and has easily accessible piping and electrical
connections.
When a negative condition exists:
6
•
Flues and stacks may experience a backdraft and cause dangerous contaminants to remain in
the occupied space. In the case of flues, the products of combustion may condense and corrode
the equipment.
•
Under negative conditions, the exhaust system sees a greater static pressure. The capacity of
each fan is reduced and this results in an inadequate removal of contaminants.
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Application Considerations
•
Drafts and cross-currents will increase in a negative condition, causing an uncomfortable or
unhealthy work environment.
What Fuel to Use?
The most common fuel for heating make-up air is natural gas. This is because 100 percent of the
energy goes into the air stream (92 percent sensible, 8 percent latent). Direct firing eliminates the
need for heat exchangers or combustion chambers that can corrode or leak. Natural gas is often
the least expensive fuel and is usually readily available.
Note: Selected horizontal and vertical units are available with special coil options (DX, chilled
water, steam or electric).
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Selection Procedure
Calculating Total External Static Pressure to Determine Fan Motor Horsepower. To
determine the fan motor horsepower, use the following steps:
1. Select Unit
– Determine cabinet size and cfm
2. Determine Static Pressure of Optional Accessories
– Add the static pressures of the optional accessories.
3. Determine External Static Pressure
– Calculate external static pressure of system due to ductwork, grilles, etc. This is the static
pressure external to the DFIA/DFOA unit and is up to the system designer to determine.
4. Calculate Total External Static Pressure
– Add the static pressures of the optional accessories to the external static pressure to
determine total external static pressure.
5. Use the Table 1, p. 16 (DFIA) and Table 10, p. 31 (DFOA) to determine the fan motor horsepower.
Example:
1. Specification calls for a 40,000 cfm unit. Select a size 225.
2. Unit will require an inlet hood, inlet damper and a v-bank filter. Therefore,the static pressure
of the optional accessories is 0.51 in. wc.
Fresh air inlet hood and birdscreen
0.13 in. wc
Motor operated inlet damper
0.13 in. wc
V-bank filter section
0.25 in. wc
Static pressure of optional accessories
0.51 in. wc
3. Engineer has determined that the external static pressure due to the ductwork is 0.75 in. wc.
4. Static Pressure of optional accessories
0.51 in. wc
External static pressure
0.75 in. wc
Total External Static Pressure
1.26 in. wc
5. For a size 225 unit at 40,000 cfm and 1.26 in. total external static pressure, a 30 hp fan motor will
be required.
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Selection Procedure
Burner Selection Procedure
For DFIA selections, use Table 3, p. 18, and select next size larger available burner. For DFOA
selections, use Table 12, p. 33.
Note: Table is based on an entering air temperature of -40°F.
Example: an 80°F temperature rise is desired for 18000 scfm.
The table shows a MBh input of 1788 MBh.
Select the 1925 MBh input burner (Digit 14, 15 = AH)
OR
Use the following formula:
MBh input =
(0.6210 x scfm x TR)
(460 + 80 + 10)
(0.6210 X ) / (460 + TR + EAT)
where:
TR =
Temperature Rise (Desired leaving air temperture – entering air temperature)
EAT =
Temperature Rise (Desired leaving air temperture – entering air temperature)
Example: A desired leaving air temperature of 90°F is required for 18000 scfm.
The entering air temperature is 10°F.
Temperature rise (TR) = 90 – 10 = 80°F
MBh input =
(0.6210 x 18000 x 80) = 1626 MBh input
(460 + 80 + 10)
Select the 1650 MBh input burner (Digit 14, 15 = AG)
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Unit Configuration
Horizontal Configurations
For all arrangements shown, controls, gas piping and fan motor are on the near side. Selected
horizontal units are available with special options — cooling coils (DX, chilled water), steam and
electric coils, no burner section. Contact your Trane representative for availability and pricing.
Figure 2. Horizontal configurations
Fan Arrangement #1
Top Discharge (For outdoor only)
Fan Arrangement #2
Side Discharge
Fan Arrangement #3
Bottom Discharge
Vertical Configurations (DFOA only)
For all arrangements shown, the gas piping and controls are on the near side. Selected vertical units
are available with special options — steam and electric coils, no burner section.
Figure 3. Vertical configuration (DFOA only)
Fan Arrangement #4
Side Discharge
10
Fan Arrangement #6
Side Discharge
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Unit Configuration
Vertical Configurations (DFIA only)
For all arrangements shown, the gas piping is on the near side. The electric control cabinet (EC) and
disconnect are on the side opposite the air entering side. Selected vertical units are available with
special options – steam and electric coils, no burner section. Contact your Trane representative for
availability.
Figure 4. Vertical configurations (DFIA only)
EC
Fan Arrangement #4
Side Discharge
EC
EC
EC
EC
Fan Arrangement #7
Top Discharge
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Fan Arrangement #6
Top Discharge
Fan Arrangement #5
Side Discharge
Fan Arrangement #8
Side Discharge
EC
Fan Arrangement #9
Side Discharge
11
DFIA
Model Number
Descriptions
Digit 14, 15 — Burner Input
Rating (Natural Gas/Propane)
Digit 1, 2, 3 — Unit Description
DFI =
Direct fired indoor unit
Digit 4 — Development
Sequence
A
=
First Generation
Digit 5 — Unit Size
109
120
215
225
112
122
218
230
115
125
220
118
130
222
Digit 8 —Burner Section
0
1
=
=
No Burner Section
Burner Section
Digit 9 —Main Power Supply
A
=
115/60/1
D
=
208/60/3
B
=
230/60/1
E
=
230/60/3
C
=
208/60/1
F
=
460/60/3
Digit 10 — Design Sequence
H
=
Eighth Design
Digit 11 — Fuel
N
P
=
=
Natural Gas
LP (Propane) Gas
Digit 12 — Gas Control Option
E
=
F
=
G
=
H
=
Modulating Discharge Temp
Control (MDT)
Modulating Room Temp Control
(MRT)
Modulating Room Temp Control
& Pro Room Sensor (MRT Pro)
Modulating Room Temp Control
& BACview® (MRT Expert)
00 =
AA =
AB =
AC =
AE =
AF =
AG =
AH =
AJ =
AK =
AL =
AN =
AP =
AQ =
AR =
AT =
AV =
AW =
AX =
AY =
AZ =
A1 =
A2 =
A3 =
A4 =
A5 =
A6 =
A7 =
A8 =
A9 =
BA =
BB =
BC =
BD =
No Burner Input Selection
275/225 MBh
550/450 MBh
825/885 MBh
1100/1125 MBh
1375/1350 MBh
1650/1575 MBh
1925/1800 MBh
2200/2025 MBh
2475/2475 MBh
2750/2700 MBh
3025/2925 MBh
3300/3150 MBh
3575/3375 MBh
3850/3825 MBh
4125/4050 MBh
4400/4275 MBh
4675/4500 MBh
4950/4950 MBh
5225/5175 MBh
5500/5400 MBh
5775/5624 MBh
6050/5850 MBh
6325/6075 MBh
6600/6525 MBh
6875/6750 MBh
7150/6975 MBh
7425/7425 MBh
7700/7650 MBh
7975 MBh
8250 MBh
8525 MBh
8800 MBh
9075 MBh
Digit 16 — Blower Motor
Horsepower
0
=
No Selection J
=
10 hp
B
=
3/4 hp
K
=
15 hp
C
=
1 hp
L
=
20 hp
Digit 18 — Fan Arrangement
1
2
3
4
5
6
7
8
9
=
=
=
=
=
=
=
=
=
Horizontal Arrangement 1 Top
Horizontal Arrangement 2 Side
Horizontal Arrangement 3 Bottom
Vertical Arrangement 4 Side
Vertical Arrangement 5 Side
Vertical Arrangement 6 Top
Vertical Arrangement 7 Top
Vertical Arrangement 8 Side
Vertical Arrangement 9 Side
Digit 20 — V-Bank Filter Section
0
A
=
=
B
=
C
D
=
=
No V-Bank Filter Section
V-Bank Section with Permanent
Filters
V-Bank Section without
Permanent Filters
V-Bank Section with TA Filters
V-Bank Section with Pleated
Filters
Digit 21 — Dampers/Mixing Box
0
=
A
=
B
C
=
=
D
=
E
=
F
=
G
=
H
=
No Damper/Mixing Box Selected
(No ETL)
Motorized Return Air Damper
(No ETL)
Motorized Damper 75/25 (No ETL)
Mixing Box - Temperature Control
(No ETL)
Mixing Box - Building Press
Control (No ETL)
Mixing Box - Manual Control
(No ETL)
Mixing Box with Airflow
Station - Manual Control (ETL)
Mixing Box with Airflow
Station - Temp Control (ETL)
Mixing Box with Airflow
Station - Bldg. Press Control (ETL)
Digit 22, 23 — Controls Opposite
from Standard
** =
AA =
Standard Controls
Controls Opposite from Standard
D
=
1-1/2 hp
M =
25 hp
Digit 13 — Gas Train Approvals
E
=
2 hp
P
30 hp
0
1
3
4
5
6
F
=
3 hp
Q
=
40 hp
G
=
5 hp
R
=
50 hp
** =
AB =
H
=
7-1/2 hp
T
=
60 hp
Digit 26, 27 —Insulation
=
=
=
=
=
=
No Selection
Standard Gas Train
IRI Gas Train Approval (ETL)
FM Gas Train Approval (ETL)
IRI Gas Train Approval (No ETL)
FM Gas Train Approval (No ETL)
=
Digit 17 — Motor Speed and
Starter
0
1
2
3
4
5
6
=
=
=
=
=
=
=
No Selection
Single Speed odp 1800 rpm
Single Speed tefc 1800 rpm
Single Speed Ener. Effic odp
Single Speed Ener. Effic tefc
2s1w odp 1800/900 rpm
2s2w odp 1800/1200 rpm
Digit 24, 25 — Motorized Inlet
Damper
AC =
No Motorized Inlet Damper
Motorized Inlet Damper
Insulation on Entire Unit
(Include Filter)
Digit 28, 29 —115V Duplex
Service Receptable with Trans.
AJ =
115V Duplex Service Receptacle
with Trans.
Digit 30, 31 — Painted Cabinet
AZ =
Painted Cabinet
DIGIT 32, 33 — UV Flame Sensor
AL =
12
Ultraviolet (UV) Flame Sensor
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DFIA
Digit 34, 35 —Clogged Filter
Indicator
AN =
Clogged Filter Indicator
Digit 36, 37— Exhaust Interlock
AP =
Exhaust Interlock
Digit 38, 39 — Interlocking Relay
AQ =
Interlocking Relay
Digit 40, 41 — Omit Disconnect
Switch
DS =
AT =
Disconect Switch
Omit Disconnect Switch
Digit 42, 43 — High Gas Pressure
Regulator
CA =
AV =
AW =
BH =
High Gas Press Reg 0.5–1 psi
High Gas Press Reg –5 psi
High Gas Press Reg 5–10 psi
High Gas Press Reg Over 10 psi
Digit 44, 45 — Adjustable Drive
AX =
Adjustable Drive
Digit 46, 47 — Low Gas Pressure
Burner
BJ =
Low Gas Pressure Burner
Digit 48, 49 — Vibration Options
A5 =
A6 =
Vibration Feet
Vibration Hangers
Digit 50, 51 — Control Options
BD =
BG =
BF =
7-Day Time Clock
On/off Night Setback Thermostat
BACview® Remote Panel
Digit 52, 53 — Discharge Louver
AY =
0 =
Discharge Louver
None
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13
DFIA
Features and Benefits
Figure 5. DFIA features and benefits
Gas burner section
Discharge fan section
V-bank Filter with hinged access door
Gas manifold and control cabinet
Feature: Basic unit is factory assembled and wired.
Benefit: Reduces field installation cost.
Feature: Factory tested.
Benefit: Eliminates majority of field start-up problem caused by defective controls.
Feature: Adjustable motor mount.
Benefit: Belt tension can be field adjusted for maximum belt life.
Feature: All fuses factory furnished.
Benefit: Delay at start-up eliminated.
Feature: Return air cycle capability.
Benefit: Return air cycle results in fuel economy for pressurized heating systems and eliminates
need for two-speed fan operation. Minimizes heating cost.
Feature: No flues or stacks are used.
Benefit: Eliminates backdraft and dangerous contaminants from entering the space.
14
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DFIA
Reliable Operation
The standard unit includes all of the controls needed for trouble-free operation.
If the designer does not utilize a master panel for consolidating mechanical equipment, an optional
remote control station should be ordered.
This device includes switches and signal lights for operating the make-up air unit and monitoring
its performance from any convenient location.
While rare, malfunctions can occur because a belt breaks, local power is interrupted or a
component fails. If this should happen, the unit’s control system is designed to take over. Its
overlapping fail-safe protective devices will turn on an alarm light and prevent burner operation
until the problem has been corrected.
Because of this attention to detail, combustion will be clean and odorless under the most adverse
conditions. The incoming “make-up air” will be at least five times purer than the requirements set
down by the U.S. Bureau of Standards.
Equipment Approval Options
Owners and specifiers have three very important reasons for wanting equipment approvals. One
reason is to establish a manufacturer’s reliability.
A second looks for conformance with equipment standards if any have been established for the
particular product. And finally, there may be requirements set down by an industrial user’s
insurance carrier.
Trane has gone to great lengths to satisfy these needs. In the first case, reliability is established for
our standard unit through conservative design and the use of U.L. listed components.
For industrial applications, the unit can also be furnished with special gas controls to comply with
FM or IRI. The latter is available for applications where the exact insurance approval agency has
not been established.
Special Construction Features
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•
External bearings for easy service and lubrication.
•
External motor for ease of service and belt maintenance.
•
Hollow fan shaft on double blower models eliminate the need for a center bearing which is
difficult to service.
•
Enlarged filter sections increasing filter life and reducing service time.
•
Hinged filter access door.
•
Service platform available as an option for easy maintenance on suspended units.
15
DFIA
Performance Data
Table 1.
Direct-Fired Indoor Air (DFIA) unit—General data
Unit Size
109
112
115
118
120
122
125
130
215
218
220
222
225
230
Min. Airflow (cfm)
1600
3250
4500
6500
9000
11000
14000
22000
9000
12500
18000
25000
30000
44000
Max. Airflow (cfm)
3000
4250
6000
8500
11000
15000
20000
30000
12000 17000
26000
31000
46000
64000
Quantity - Wheel Size
1-9
1 - 12
1 - 15
1 - 18
1 - 20
1 - 22
1 - 25
1 - 30
2 - 15
2 - 18
2 - 20
2 - 22
2 - 25
2 - 30
Motor (hp)
1–5
1.5–5
2–7.5
3–10
5–10
5–15
7.5–20
10–30
5–15
7.5–20 7.5–25 15–30
15–50
20–60
Airflow
Fan
Filters, 2-in
Quantity
4
4
9
9
10
10
24
24
18
18
35
35
42
42
Size (in)
20x20
20x20
20x16
20x16
20x25
20x25
20x16
20x16
20x15
20x15
20x16
20x16
20x20
20x20
Table 2.
Models
DFI
109
112
115
118
120
Direct-Fired Indoor Air (DFIA) unit—Performance data
Blower
Size (in.)
1–9
1–12
1–15
1–18
1–20
CFM
Std Air
at 70
FPM
Outlet
Velocity
1600
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
1914
1
1
1
1
1900
2273
1
1
1-1/2
1-1/2
2200
2632
1-1/2
1-1/2
1-1/2
1-1/2
2600
3110
2
2
2
3000
3589
3
3
3
3250
2257
1-1/2
2
3500
2431
2
3750
2604
4000
2778
4250
1
1-1/4
1-1/2
2
—
—
—
—
1-1/2
1-1/2
2
—
2
2
2
3
2
3
3
3
3
3
3
3
3
5
2
2
2
3
3
3
2
2
2
3
3
3
5
2
2
3
3
3
3
3
5
3
3
3
3
3
3
5
5
2951
3
3
3
3
3
5
5
5
4500
2239
2
2
3
3
3
3
5
—
5000
2488
3
3
3
3
3
5
5
5
5500
2736
3
3
3
3
5
5
5
5
6000
2985
3
5
5
5
5
5
5
7-1/2
6500
2265
3
5
5
5
5
5
5
7-1/2
7000
2439
5
5
5
5
5
5
7-1/2
7-1/2
7500
2613
5
5
5
5
5
7-1/2
7-1/2
7-1/2
8000
2787
5
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
8500
2962
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
10
9000
2143
5
5
5
5
7-1/2
7-1/2
7-1/2
—
9500
2262
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
—
10000
2381
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
10
10500
2500
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
11000
2619
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
10
Horsepower
Note: Use the following static pressures for the optional accessories:
1. Motor Operated Inlet Damper: 0.13 in. wc
2. V-Bank Filter Section: 0.25 in. wc
3. Mixing Box: 0.40 in. wc
4. Discharge Louver: 0.13 in. wc
16
MUA-PRC007-EN
DFIA
Table 2.
Models
DFI
122
125
130
215
218
220
Direct-Fired Indoor Air (DFIA) unit—Performance data (continued)
Blower
Size (in.)
1–22
1–25
1–30
2–15
2–18
2–20
CFM
Std Air
at 70
FPM
Outlet
Velocity
11000
12000
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
2157
5
5
7 -1/2
7-1/2
7-1/2
7-1/2
10
—
2353
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
15
15
Horsepower
13000
2549
7-1/2
7-1/2
7-1/2
10
10
10
10
14000
2745
7-1/2
10
10
10
10
15
15
15
15000
2941
—
10
10
10
15
15
15
15
14000
2086
7-1/2
7-1/2
7-1/2
7-1/2
10
—
—
—
15000
2235
7-1/2
7-1/2
7-1/2
10
10
10
15
—
16000
2385
7-1/2
7-1/2
7-1/2
10
10
15
15
—
18000
2683
10
10
10
10
15
15
15
15
20000
2981
15
15
15
15
15
15
15
20
22000
2486
10
10
10
15
15
15
15
—
24000
2581
10
15
15
15
15
15
20
20
26000
2796
15
15
15
15
20
20
20
25
28000
3011
15
15
15
20
20
20
20
25
30000
3226
20
20
20
20
20
25
25
30
9000
2239
5
5
5
5
5
—
—
—
9500
2363
5
5
5
5
7-1/2
7-1/2
—
—
10000
2488
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
—
10500
2612
5
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
—
11000
2736
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
11500
2861
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
10
12000
2985
7-1/2
7-1/2
7-1/2
7-1/2
10
10
10
15
12500
2178
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
—
—
—
13000
2265
7-1/2
7-1/2
7-1/2
7-1/2
10
10
—
—
14000
2439
7-1/2
7-1/2
7-1/2
10
10
10
15
—
15000
2613
7-1/2
10
10
10
10
15
15
15
16000
2787
10
10
10
10
15
15
15
15
17000
2962
10
10
10
15
15
15
15
20
18000
2143
7-1/2
10
10
10
15
15
15
—
19000
2262
10
10
10
10
15
15
15
—
20000
2381
10
10
10
15
15
15
15
20
21000
2500
10
15
15
15
15
15
20
20
22000
2619
15
15
15
15
15
15
20
20
23000
2738
15
15
15
15
15
20
20
20
24000
2857
15
15
15
15
20
20
20
25
25000
2976
15
15
15
20
20
20
20
25
26000
3095
15
20
20
20
20
20
25
25
Note: Use the following static pressures for the optional accessories:
1. Motor Operated Inlet Damper: 0.13 in. wc
2. V-Bank Filter Section: 0.25 in. wc
3. Mixing Box: 0.40 in. wc
4. Discharge Louver: 0.13 in. wc
MUA-PRC007-EN
17
DFIA
Table 2.
Models
DFI
Direct-Fired Indoor Air (DFIA) unit—Performance data (continued)
Blower
Size (in.)
222
CFM
Std Air
at 70
FPM
Outlet
Velocity
25000
2-22
225
2-25
230
2-30
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
2451
15
15
15
15
26000
2549
15
15
15
20
27000
2647
15
15
15
28000
2745
15
20
20
29000
2843
20
20
30000
2941
20
31000
3039
30000
2235
32000
1
1-1/4
1-1/2
2
20
20
20
25
20
20
20
25
20
20
20
25
25
20
20
25
25
30
20
20
25
25
25
30
20
20
20
25
25
25
30
20
20
20
25
25
25
30
30
15
15
15
15
20
20
—
—
2385
15
15
15
20
20
25
25
—
34000
2534
15
20
20
20
20
25
25
30
36000
2683
20
20
20
20
25
25
30
30
38000
2832
20
20
20
25
25
30
30
40
40000
2981
20
25
25
25
30
30
30
40
42000
3130
25
25
25
30
30
30
40
40
44000
3279
25
30
30
30
40
40
40
40
46000
3428
30
30
30
40
40
40
40
50
44000
2366
20
20
20
25
25
30
—
—
48000
2581
20
25
25
25
30
30
40
—
52000
2796
25
25
30
30
40
40
40
50
56000
3011
30
30
30
40
40
40
40
50
60000
3226
30
40
40
40
40
50
50
50
64000
3441
40
40
40
50
50
50
50
60
Horsepower
Note: Use the following static pressures for the optional accessories:
1. Motor Operated Inlet Damper: 0.13 in. wc
2. V-Bank Filter Section: 0.25 in. wc
3. Mixing Box: 0.40 in. wc
4. Discharge Louver: 0.13 in. wc
Table 3.
Direct-Fired Indoor Air (DFIA) unit—Burner selection table (MBh)
DFIA Model
109
112
18
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
130° Rise
1600
142
159
175
191
206
221
235
1900
169
189
208
227
245
262
279
2200
195
219
241
263
284
304
323
2600
231
258
285
311
335
359
382
3000
266
298
329
358
387
414
440
3250
288
323
356
388
419
449
477
3500
311
348
384
418
451
483
514
3750
333
373
411
448
483
518
550
4000
355
397
438
478
516
552
587
4250
377
422
466
508
548
587
624
MUA-PRC007-EN
DFIA
Table 3.
Direct-Fired Indoor Air (DFIA) unit—Burner selection table (MBh) (continued)
DFIA Model
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
130° Rise
4500
399
447
493
537
580
621
661
5000
444
497
548
597
644
690
734
5500
488
546
603
657
709
759
807
6000
532
596
658
717
773
828
881
6500
577
646
712
776
838
897
954
115
118
120
122
125
130
215
218
MUA-PRC007-EN
7000
621
696
767
836
902
966
1027
7500
616
704
792
880
968
1057
1101
8000
710
795
877
955
1031
1104
1174
8500
754
845
932
1015
1096
111733
1248
9000
798
894
986
1057
1160
1242
1321
9500
798
894
986
1057
1160
1242
1321
10000
887
994
1096
1194
1289
1380
1468
10500
863
986
1109
1233
1356
1479
1541
11000
976
1039
1205
1314
1418
1518
1615
11000
976
1039
1205
1314
1418
1518
1615
12000
1065
1192
1315
1433
1547
1656
1761
13000
1153
1292
1425
1553
1676
1794
1908
14000
1242
1391
1534
1672
1804
1932
2055
15000
1331
1409
1644
1791
1933
2070
2202
14000
1242
1391
1534
1672
1804
1932
2055
15000
1331
1409
1644
1791
1933
2070
2202
16000
1419
1590
1753
1911
2062
2208
2349
17000
1508
1689
1863
2030
2191
2346
2495
18000
1597
1788
1973
2150
2320
2484
2642
20000
1774
1987
2192
2388
2578
2760
2936
22000
1952
2186
2411
2627
2836
3036
3229
24000
2129
2385
2630
2866
3093
3312
3523
26000
3207
2583
2849
3105
3351
3588
3816
28000
2484
2782
3069
3344
3609
3864
4110
30000
2661
2981
3288
3583
3867
4140
4404
9000
798
894
986
1057
1160
1242
1321
9500
798
894
986
1057
1160
1242
1321
10000
887
994
1096
1194
1289
1380
1468
10500
863
986
1109
1233
1356
1479
1541
11000
976
1039
1205
1314
1418
1518
1615
11500
1020
1143
1260
1373
1482
1587
1688
12000
1065
1192
1315
1433
1547
1656
1761
13000
1153
1292
1452
1553
1676
1794
1908
14000
1242
1319
1534
1672
1804
1932
2055
15000
1331
1490
1644
1791
1933
2070
2202
16000
1419
1590
1753
1911
2062
2208
2349
17000
1508
1689
1863
2030
2191
2346
2495
19
DFIA
Table 3.
Direct-Fired Indoor Air (DFIA) unit—Burner selection table (MBh) (continued)
DFIA Model
220
222
225
230
20
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
130° Rise
18000
1597
1788
1973
2105
2320
2484
2642
19000
1686
1888
2082
2269
2449
2622
2789
20000
1774
1987
2192
2388
2578
2760
2936
21000
1726
1972
2219
2465
2712
2958
3082
22000
1952
2186
2411
2627
2836
3036
3229
23000
2040
2285
2521
2747
2964
3174
3376
24000
2129
2385
2630
2866
3093
3312
3523
25000
2218
2484
2740
2986
3222
3450
3670
26000
2307
2583
2849
3105
3351
3588
3816
25000
2218
2484
2740
2986
3222
3450
3670
26000
2307
2583
2849
3105
3351
3588
3816
27000
2395
2683
2959
3224
3480
3726
3963
28000
2484
2782
2069
3344
3609
3864
4110
29000
2573
2881
3064
3404
3745
4085
4257
30000
2465
2817
3178
3463
3738
4002
4257
31000
2750
3080
3397
3702
3996
4278
4550
30000
2661
2981
3288
3583
3867
4140
4404
32000
2839
3180
3507
3822
4124
4416
4697
34000
3016
3378
3726
4060
4382
4692
4991
36000
3194
3577
3945
4299
4640
4968
5284
38000
3371
3776
4164
4538
4898
5544
5578
40000
3549
3974
4384
4777
5156
5520
5871
42000
3451
3944
4437
4930
5423
5917
6165
44000
3903
4372
4822
5255
5671
6072
6458
46000
4081
4571
5041
5494
5929
6348
6752
44000
3903
4372
4822
5255
5671
6072
6458
48000
4258
4769
5260
5732
6187
6624
7046
52000
4613
5167
5699
6210
6702
7176
7633
56000
4968
5564
6317
6688
7218
7728
8220
60000
5323
5962
6575
7165
7733
8280
8807
64000
5678
6359
7014
7643
8249
8832
9394
MUA-PRC007-EN
DFIA
Dimensions
Figure 6. Horizontal arrangement single blower
Unit Components
1. Inlet damper
2. R/A section (before
Burner)
3. V-bank
4. Burner section
5. R/A section (after
burner)
Plain View
6. Blower section
7.
Filter access
8. Adjustable profile
9. Control cabinet
10. Access door (piping
compartment)
11. Gas piping manifold
12. R/A acces
Front View
13. Return air damper
14. Belt guard
Table 4.
Dimensions for horizontal arrangement—Single blower DFIA
Model
A
B
C
D
E
F
H
J
K
L
M
N
P
109
29
45
33
12
10-1/2
16-1/2
30
8-1/4
28
23-3/4
34
25-1/8
34-1/2
112
29
45
33
15-3/4
13-3/8
14-5/8
30
8-1/4
28
23-3/4
34
25-1/8
34-1/2
115
37-1/4
51
43
18-3/4
16
16-1/8
30
14-1/4
43
39-3/4
40
40-1/4
40-1/2
118
37-1/4
51
43
22
19
14-1/2
30
14-1/4
43
39-3/4
40
40-1/4
40-1/2
120
54
60
52
24-7/8
24-7/8
17-9/16
48
14-1/4
52
48-3/4
49
49-1/8
49-1/2
122
54
60
52
27-3/8
27-3/8
16-5/16
48
14-1/4
52
48-3/4
49
49-1/8
49-1/2
125
66
72
60
31-3/8
31-3/8
20-5/16
60
20-1/4
52
48-3/4
61
49-1/8
61-1/2
130
66
72
60
36-7/8
36-7/8
17-9/16
60
20-1/4
52
48-3/4
61
49-1/8
61-1/2
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
21
DFIA
Figure 7.
Horizontal arrangement twin blowers
Unit Components
1. Inlet damper
2. R/A section (before
Burner)
3. V-bank
4. Burner section
5. R/A section (after burner)
6. Blower section
7.
Filter access
8. Adjustable profile
Plan View
9. Control cabinet
10. Access door (piping
compartment)
11. Gas piping manifold
12. R/A acces
13. Return air damper
14. Belt guard
Front View
Table 5.
Dimensions for horizontal arrangement—Single blower DFIA
Model
A
B
C
D
E
F
G
H
J
K
L
M
N
P
215
37-1/4
93
43
18-3/4
16
16-1/8
22-1/2
79
10
43
39-3/4
82
40-1/4
82-1/2
218
37-1/4
93
43
22
19
13-1/4
22-1/2
79
10
43
39-3/4
82
40-1/4
82-1/2
220
54
120
52
24-7/8
24-7/8
20-1/4
29-5/8
96
14-1/4
52
48-3/4
109
49-1/8
109-1/2
222
54
120
52
27-3/8
27-3/8
14-1/2
29-5/8
96
14-1/4
52
48-3/4
109
49-1/8
109-1/2
225
66
144
60
31-3/8
31-3/8
21-3/4
37-5/8
120
20-1/4
52
48-3/4
133
49-1/8
133-3/8
230
66
144
60
36-7/8
36-7/8
18-5/8
33
120
20-1/4
52
48-3/4
133
49-1/8
133-3/8
Note: All dimensions in inches subject to manufacturing tolerances.
22
MUA-PRC007-EN
DFIA
Figure 8. Single blower vertical units
Unit Components
1. Inlet damper
2. R/A section (before burner)
3. V-bank
4. Burner section
VST Discharge
5. R/A section (after burner)
Plan View
6. Blower section
7.
Filter access
8. Adjustable profile
9. Control cabinet
10. Access door (piping compartment)
11. Gas piping manifold
12. R/A acces
13. Return air damper
14. Belt guard
15. Screen
Front View
Side View
Table 6.
Dimensions for single blower vertical units—DFIA
Model
A
B
C
D
E
F
H
J
K
L
M
N
PN
Q
R
S
109
29
45
33
12
10-1/2
16-1/8
30
8-1/4
28
23-3/4
34
25-1/8
34-1/2
36
32
17-1/4
112
29
45
33
15-3/4
13-3/8
14-5/8
30
8-1/4
28
23-3/4
34
25-1/8
34-1/2
36
32
17-1/4
115
37-1/4
51
43
18-3/4
16
16-1/8
29-5/8
14-1/4
43
39-3/4
40
40/4
40-1/2
36
32
17-1/4
118
37-1/4
51
43
22
19
14-1/2
30
14-1/4
43
39-3/4
40
40-1/4
40-1/2
36
32
20
120
54
60
52
24-7/8
24-7/8
17-9/16
48
14-1/4
52
48-3/4
49
49-1/8
49-1/2
48
44
20
122
54
60
52
27-3/8
27-3/4
16-5/16
48
14-1/4
52
48-3/4
49
49-1/8
49-1/2
48
44
20
125
66
72
60
31-3/4
31-3/8
20-5/16
60
20-1/4
52
48-3/4
61
49-1/8
61-1/2
48
44
21
130
66
72
60
36-7/8
36-7/8
17-9/16
60
20-1/4
52
48-3/4
61
49-1/8
61-1/2
48
44
21
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
23
DFIA
Figure 9. Twin blower models vertical units
Unit Components
1. Inlet damper
2. R/A section (before
burner)
3. V-bank
4. Burner section
VST Discharge
5. R/A section (after
burner)
Plan View
6. Blower section
7.
Filter access
8. Adjustable profile
9. Control cabinet
10. Access door
11. Gas piping manifold
12. R/A acces
13. Return air damper
14. Belt guard
15. Screen
Side View
Table 7.
Front View
Dimensions for twin blower vertical units—DFIA
Model
A
B
C
D
E
F
G
H
J
K
L
M
N
P
Q
R
S
215
37-1/4
93
43
18-3/4
16
16-1/8
22-1/2
79
10
43
39-3/4
82
40-1/4
82-1/2
36
32
18-1/2
218
37-1/4
93
43
22
19
13-1/4
22-1/2
79
10
43
39-3/4
82
40-1/4
82-1/2
36
32
22
220
54
120
52
24-7/8
24-7/8
20-1/4
29-5/8
96
14-1/4
52
48-3/4
109
49-1/8 109-1/2
48
44
22
222
54
120
52
27-3/8
27-3/8
17-3/4
29-5/8
96
14-1/4
52
48-3/4
109
49-1/8 109-1/2
48
44
23-1/2
225
66
144
60
31-3/8
31-3/8
21-3/4
37-5/8
120
20-1/4
52
48-3/4
133
49-1/8 133-1/2
48
44
32-3/4
230
66
144
60
36-7/8
36-7/8
18-5/8
33
120
20-1/4
52
48-3/4
133
49-1/8 133-1/2
48
44
32-3/4
Note: All dimensions in inches subject to manufacturing tolerances.
24
MUA-PRC007-EN
DFIA
Figure 10. DFIA Accessories dimensional data
Return air Probe Box
Table 8.
MUA-PRC007-EN
DFIA Accesories dimensional data
Model
A
B
C
D
E
109–112
2 ft 5 in
3 ft 9 in
1 ft 5-3/8 in
1 ft 2-3/8 in
2 ft 4 in
115–118
3 ft 1-1/4 in
4 ft 3 in
1 ft 11 in
1 ft 8-3/8 in
3 ft 7 in
120–122
4 ft 6 in
5 ft 0 in
2 ft 4-1/2 in
3 ft 3-1/4 in
4 ft 4 in
125–130
5 ft 6 in
6 ft 0 in
3 ft 4-1/8 in
3 ft 3-1/4 in
4 ft 4 in
215–218
3 ft 1-1/4 in
7 ft 9 in
5 ft 7-3/4 in
1 ft 8-3/8 in
3 ft 7 in
220–222
4 ft 6 in
10 ft 0 in
7 ft 1-3/4 in
3 ft 3-1/4 in
4 ft 4 in
225–230
5 ft 6 in
12 ft 0 in
9 ft 1/8 in
3 ft 3-3/4 in
4 ft 4 in
25
DFIA
Weights
Figure 11. DFIA approximate weights
RETURN AIR
Table 9.
DFIA Approximate weights
Return
Air
(Before
Burner)
Burner
Section
Return
Air(a)
(After
Burner)
Discharg
e Louver
Unit Size
Blower
Section
Vertical
Support
Stand
A
B
C
D
109
350
180
55
165
104
260
104
70
67
149
67
67
112
350
180
55
165
104
260
104
70
67
149
67
67
115
535
210
70
185
178
375
116
80
94
253
94
94
118
535
210
70
185
178
375
116
80
94
253
94
94
120
916
420
120
275
2809
550
151
110
159
439
159
159
122
916
420
120
275
280
550
151
110
159
439
159
159
125
1262
570
155
310
386
700
208
125
224
590
224
224
130
1262
570
155
310
386
700
208
125
224
590
224
224
215
912
500
125
275
217
510
141
150
158
438
158
158
218
912
500
125
275
217
510
141
150
158
438
158
158
220
1501
625
233
410
420
725
226
215
268
697
268
268
222
1501
625
233
410
420
725
226
215
268
697
268
268
225
2117
845
340
500
560
1010
302
230
388
953
388
388
230
2117
845
340
500
560
1010
302
230
388
953
388
388
Inlet(a) V-Bank(a
)Filter
Damper
(a) When a mixing box option is ordered, these three accessory weights need to be totaled: Inlet Damper, V-Bank Filter, and Return Air (After Burner).
26
MUA-PRC007-EN
DFOA
Model Number
Descriptions
Digit 1, 2, 3 — Unit Type
DFO=
Direct-Fired Outdoor Unit
Digit 4 — Development
Sequence
A
=
First Generation
Digit 5, 6, 7 — Unit Size
109
118
220
112
215
222
115
218
225
230
Digit 8 — Main Power Supply
A
=
115/60/1
D
=
208/60/3
B
=
230/60/1
E
=
230/60/3
C
=
208/60/1
F
=
460/60/3
Digit 9 — Fuel
N
P
=
=
Natural Gas
LP (Propane) Gas
Digit 10 — Design Sequence
H
=
Eighth Design
Digit 11 — Gas Control Option
Digit 13 — Burner Input Rating
(Natural/Propane)
Digit 18— Inlet Hood and
Birdscreen
AA =
AB =
AC =
AE =
AF =
AG =
AH =
AJ =
AK =
AL =
AN =
AP =
AQ =
AR =
AT =
AV =
AW =
AX =
AY =
AZ =
A1 =
A2 =
A3 =
A4 =
A5 =
A6 =
A7 =
A8 =
A9 =
O
A
=
=
B
=
275/225 MBh
550/450 MBh
825/675 MBh
1100/1125 MBh
1375/1350 MBh
1650/1575 MBh
1925/1800 MBh
2200/2025 MBh
2475/2475 MBh
2750/2700 MBh
3025/2925 MBh
3300/3150 MBh
3575/3375 MBh
3850/3825 MBh
4125/4050 MBh
4400/4275 MBh
4675/4500 MBh
4950/4950 MBh
5225/5175 MBh
5500/5400 MBh
5775/5624 MBh
6050/5850 MBh
6325/6075 MBh
6600/6525 MBh
6875/6750 MBh
7150/6975 MBh
7425/7425 MBh
7700/7650 MBh
7975 MBh
Digit 19 — V-Bank Filter Section
0
A
=
=
B
=
C
D
=
=
0
=
A
=
B
=
C
=
D
=
E
=
F
=
G
=
0
=
No Selection J
=
10 hp
H
=
B
=
3/4 hp
K
=
15 hp
C
=
1 hp
L
=
20 hp
Digit 12 — Gas Train Approvals
D
=
1-1/2 hp
M =
25 hp
0
1
3
4
5
6
E
=
2 hp
P
=
30 hp
F
=
3 hp
Q
=
40 hp
G
=
5 hp
R
=
50 hp
H
=
7-1/2 hp
T
=
60 hp
=
F
G
=
=
H
=
=
=
=
=
=
=
Modulating Discharge Temp
Control
Modulating Room Temp Control
Modulating Room Temp Control
& Pro Room Sensor
Modulating Room Temp Control
& BACview®
No Selection
Standard Gas Train
IRI Gas Train Approval (ETL)
FM Gas Train Approval (ETL)
IRI Gas Train Approval (No ETL)
FM Gas Train Approval (No ETL)
Digit 16 — Motor Speed and
Starter
0
1
2
3
4
5
6
=
=
=
=
=
=
=
No Selection
Single Speed odp 1800 rpm
Single Speed tefc 1800 rpm
Single Speed Ener. Effic odp
Single Speed Ener. Effic tefc
2s1w odp 1800/900 rpm
2s2w odp 1800/1200 rpm
Digit 17 — Fan Arrangement
2
3
4
6
=
=
=
=
No V-Bank Filter Section
V-Bank Section with Permanent
Filters
V-Bank Section without
Permanent Filters
V-Bank Section with TA Filters
V-Bank Section with Pleated
Filters
Digit 20 — Damper/Mixing Box
Digit 15 — Blower Motor
Horsepower
E
No Inlet Hood and Birdscreen
Inlet Hood/Birdscreen with
Permanent Filters
Inlet Hood/Birdscreen without
Permanent Filters
Horizontal Arrangement 2, Front
Horizontal Arrangement 3,
Bottom
Vertical Arrangement 4, Side
Vertical Arrangement 6, Side
No Damper/Mixing Box Selected
(No ETL)
Motorized 75/25 Damper
(Manual Control)
Motorized Damper 75/25
(Bldg Press Control)
Mixing Box - Temperature Control
(No ETL)
Mixing Box - Building Press
Control (No ETL)
Mixing Box - Manual Control
(No ETL)
Mixing Box with Airflow
Station - Manual Control (ETL)
Mixing Box with AIrflow
Station - Temp Control (ETL)
Mixing Box with Airflow
Station - Bldg Press Control (ETL)
Digit 21 — Controls Opposite
from Standard
0
A
=
=
Standard Controls
Controls Opposite from Standard
Digit 22 — Motorized Inlet
Damper
0
B
=
=
No Motorized Inlet Damper
Motorized Inlet Damper
Digit 23 — Motorized Outlet
Damper
0
C
=
=
No Motorized Outlet Damper
Motorized Outlet Damper
Digit 24 — Insulation
D
=
Insulation on Entire Unit
Digit 25 — Internal Blower/Motor
Isolation
F
=
Internal Blower/Motor Isolation
Digit 26 — Extended Grease
Lines
G
=
Extended Grease Lines
Digit 27 — 115V Duplex Service
Receptable
K=115 Volt Duplex Service Receptacle
MUA-PRC007-EN
27
DFOA
Digit 28 — Painted Basic Unit
and Accessories
M =
Painted Basic Unit and
Accessories
Digit 29 — UV Flame Sensor
N
=
UV Flame Sensor
Digit 30 — Clogged Filter
Indicator
P
=
Clogged Filter Indicator
Digit 31 — Exhaust Interlock
Q
=
Exhaust Interlock
Digit 32 — Interlocking Relay
R
=
Interlocking Relay
Digit 33 — Omit Disconnect
Switch
DS =
V =
Disconect Switch
Omit Disconnect Switch
Digit 34 — High Gas Pressure
Regulator
7
W
X
6
=
=
=
=
High Gas Press Reg 0.5–1 psi
High Gas Press Reg 1–5 psi
High Gas Press Reg 5–10 psi
High Gas Press Reg Over 10 psi
Digit 35 — Adjustable Drive
Y
=
Adjustable Drive
Digit 36 — Low Gas Pressure
Burner
8
=
Low Gas Pressure Burner
Digit 37 — Vibration Options
Z
Vibration Feet—Full Unit
Digit 38 — Control Options
2
5
7
=
=
=
7-Day Time Clock
On/Off Night Setback Thermostat
BACview® Remote Panel
Digit 39 — Discharge Louver
M =
Discharge Louver
Digit 40 — Separator for Unit
Model Number
#
=
Separator for AOS Model
Number
Digit 41 — Roofcurbs
A
=
B
=
C
=
28
Curb for Basic Frame, No
Return Air
Curb for Basic Frame Return
Air Downstream
Curb for Basic Frame with
Mixing Box
MUA-PRC007-EN
DFOA
Features and Benefits
MUA-PRC007-EN
29
DFOA
Basic Unit
Feature: Casing with galvanized finish.
Benefit: Rust problem is greatly reduced.
Feature: Watertight construction.
Benefit: Designed for indoor or outdoor mounting.
Feature: Access doors are hinge mounted with industrial type hardware.
Benefit: Provides simple access to service compartments without removing sheet metal screws
and panels.
Feature: Adjustable motor mount
Benefit: Belt tension can be field adjusted for maximum belt life and for motor speed adjustment
Feature: Basic unit is factory assembled and wired.
Benefit: Reduces field installation cost.
Feature: All fuses factory furnished.
Benefit: Delay at start-up eliminated.
Feature: Factory tested before being shipped.
Benefit: Eliminates majority of field start-up problems caused by defective controls.
Gas-Fired Unit
Feature: Many units bear the ETL label.
Benefit: Meets certain specification requirements.
Feature: Optional temperature control systems available.
Benefit: Select system to satisfy application.
Feature: Optional dual fuel gas manifold.
Benefit: Standby flexibility in case natural gas supply is interrupted.
Feature: Optional construction provides returnair cycle.
Benefit: Maximum 80 percent return air cycle results in fuel economy for pressurized heating
systems and eliminates need for two-speed fan operation. Minimizes heating costs.
30
MUA-PRC007-EN
DFOA
Performance Data
Table 10. Direct-Fired Outdoor Air (DFOA) unit—General data
Unit Size
109
112
115
118
215
218
220
222
225
230
Min. Airflow (cfm)
1600
3250
4500
Max. Airflow (cfm)
3000
4250
6000
6500
9000
12500
18000
25000
30000
44000
8500
12000
17000
26000
31000
46000
64000
Quantity - Wheel Size
1-9
1 - 12
1 - 15
1 - 18
2 - 15
2 - 18
2 - 20
2 - 22
2 - 25
2 - 30
Motor (hp)
1–5
1.5–5
2–7.5
3–10
5–15
7.5–20
7.5–25
15–30
15–50
20–60
Airflow
Fan
Filters, 2-in V-Bank Filter
Quantity
9
9
9
9
18
18
25
25
36
36
Size (in)
20x15
20x15
20x15
20x15
20x15
20x15
20x20
20x20
20x25
20x25
4
4
8
8
16
16
18
18
66
66
20x16
20x16
20x16
20x16
20x16
20x16
20x25
20x25
20x15
20x15
Inlet Hood and Birdscreen
Quantity
Size
Table 11. Direct-Fired Outdoor Air (DFOA) unit—Performance data
Models
DFO
109
112
115
Blower
Size (in.)
1–9
1–12
1–15
CFM
Std Air
at 70
FPM
Outlet
Velocity
1600
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
1915
1
1
1
1
1800
2155
1
1
1-1/2
1-1/2
—
—
—
—
1-1/2
1-1/2
—
2000
2390
1-1/2
1-1/2
1-1/2
1-1/2
1-1/2
—
2
2
—
2250
2690
1-1/2
1-1/2
1-1/2
2
2
2
2
3
2500
2990
2
2
2
2
2
3
3
3
2750
3290
2
2
2
3
3
3
3
3
3000
3585
3
3
3
3
3
3
5
5
3250
2180
1-1/2
2
2
2
3
3
3
3
3500
2360
2
2
2
3
3
3
3
5
3750
2540
2
2
3
3
3
3
3
5
4000
2720
3
3
3
3
3
3
5
5
4250
2900
3
3
3
3
3
5
5
5
4500
2190
2
2
3
3
3
3
5
—
5000
2430
3
3
3
3
3
5
5
5
5500
2670
3
3
3
5
5
5
5
5
6000
2910
3
5
5
5
5
5
5
7-1/2
Horsepower
Note: External Pressure Drop in inches of water. Add pressure drop of the optional accessories, if used, to the pressure drop of the duct work:
1. Fresh Air Inlet Hood and Birdscreen: 13 in. wc
2. Fresh Air Inlet Hood with Filters: 25 in. wc
3. Motor Operated Inlet Damper: 13 in. wc
4. Motor Operated Discharge Damper: 50 in. wc
5. V-Bank Filter Section: 25 in. wc
6. Mixing Box: 40 in. wc
7. Discharge Louver: 13 in. wc
MUA-PRC007-EN
31
DFOA
Table 11. Direct-Fired Outdoor Air (DFOA) unit—Performance data (continued)
Models
DFO
118
215
218
220
222
Blower
Size (in.)
1–18
2–15
2–18
2–20
2–22
CFM
Std Air
at 70
FPM
Outlet
Velocity
6500
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
2215
3
5
5
5
5
7000
2390
5
5
5
5
5
5
5
7-1/2
5
7-1/2
7-1/2
7500
2565
5
5
5
5
5
7-1/2
7-1/2
7-1/2
8000
2740
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
Horsepower
8500
2915
5
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
9000
2190
5
5
5
5
5
—
—
—
9500
2310
5
5
5
5
7-1/2
7-1/2
—
—
10000
2430
5
5
5
7-1/2
7-1/2
7-1/2
7-1/2
—
10500
2550
5
5
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
—
11000
2670
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
11500
2790
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
10
10
10
12000
2910
7-1/2
7-1/2
7-1/2
7 -1/2
10
10
10
15
12500
2125
7-1/2
7-1/2
7-1/2
7-1/2
7-1/2
—
—
—
13000
2215
7-1/2
7-1/2
7-1/2
7-1/2
10
10
—
—
14000
2390
7-1/2
7-1/2
7-1/2
10
10
10
15
—
15000
2565
7-1/2
10
10
10
10
15
15
15
16000
2740
10
10
10
10
15
15
15
15
17000
2915
10
10
10
15
15
15
15
20
18000
2140
7-1/2
10
10
10
15
15
15
—
19000
2260
10
10
10
10
15
15
15
—
20000
2380
10
10
10
15
15
15
15
20
21000
2500
10
15
15
15
15
20
20
20
22000
2620
15
15
15
15
15
15
20
20
23000
2740
15
15
15
15
15
20
20
20
24000
2860
15
15
15
15
20
20
20
25
25000
2980
15
15
15
20
20
20
20
25
26000
3100
15
20
20
20
20
20
25
25
25000
2450
15
15
15
15
20
20
20
25
26000
2550
15
15
15
20
20
20
20
25
27000
2650
15
15
15
20
20
20
25
25
28000
2750
15
20
20
20
20
25
25
30
29000
2850
20
20
20
20
25
25
25
30
30000
2950
20
20
20
20
25
25
25
30
31000
3050
20
20
20
25
25
25
30
30
Note: External Pressure Drop in inches of water. Add pressure drop of the optional accessories, if used, to the pressure drop of the duct work:
1. Fresh Air Inlet Hood and Birdscreen: 13 in. wc
2. Fresh Air Inlet Hood with Filters: 25 in. wc
3. Motor Operated Inlet Damper: 13 in. wc
4. Motor Operated Discharge Damper: 50 in. wc
5. V-Bank Filter Section: 25 in. wc
6. Mixing Box: 40 in. wc
7. Discharge Louver: 13 in. wc
32
MUA-PRC007-EN
DFOA
Table 11. Direct-Fired Outdoor Air (DFOA) unit—Performance data (continued)
Models
DFO
Blower
Size (in.)
225
230
2–25
2–30
CFM
Std Air
at 70
FPM
Outlet
Velocity
30000
Total External Static Pressure (in. wc)
1/4
3/8
1/2
3/4
1
2235
15
15
15
15
20
32000
2385
15
15
15
20
20
34000
2535
15
20
20
20
36000
2685
20
20
20
20
38000
2835
20
20
20
40000
2985
20
25
42000
3135
25
44000
3285
25
46000
3430
44000
1-1/4
1-1/2
2
20
—
—
20
25
—
20
25
25
30
25
25
30
30
25
25
30
30
40
25
25
30
30
30
40
25
25
30
30
40
40
40
30
30
30
40
40
40
40
30
30
30
40
40
40
40
50
2365
20
20
20
25
25
30
—
—
48000
2580
20
25
25
25
30
30
40
—
52000
2800
25
25
30
30
40
40
40
50
56000
3020
30
30
30
40
40
40
40
50
60000
3240
40
40
40
40
40
50
50
50
64000
3440
40
40
40
50
50
50
50
60
Horsepower
Note: External Pressure Drop in inches of water. Add pressure drop of the optional accessories, if used, to the pressure drop of the duct work:
1. Fresh Air Inlet Hood and Birdscreen: 13 in. wc
2. Fresh Air Inlet Hood with Filters: 25 in. wc
3. Motor Operated Inlet Damper: 13 in. wc
4. Motor Operated Discharge Damper: 50 in. wc
5. V-Bank Filter Section: 25 in. wc
6. Mixing Box: 40 in. wc
7. Discharge Louver: 13 in. wc
Table 12. Direct-Fired Outdoor Air (DFOA) unit—Burner selection table (MBh)
DFOA Model
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
130° Rise
1600
142
159
175
191
206
221
235
1800
160
179
179
215
232
248
264
2000
177
199
219
239
258
276
294
2250
200
224
247
269
290
311
330
2500
222
248
274
299
322
345
367
2750
244
273
201
328
354
380
404
3000
266
298
329
358
387
414
440
109
112
115
MUA-PRC007-EN
3250
288
323
356
388
419
449
477
3500
311
348
384
418
451
483
514
3750
333
373
411
448
483
518
550
4000
355
397
438
478
516
552
587
4250
377
422
466
508
548
587
624
4500
399
447
493
537
580
621
661
5000
444
497
548
597
644
690
734
5500
488
546
603
657
709
759
807
6000
533
596
658
717
773
828
881
33
DFOA
Table 12. Direct-Fired Outdoor Air (DFOA) unit—Burner selection table (MBh) (continued)
DFOA Model
118
215
218
220
222
225
34
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
6500
577
646
712
776
838
897
954
7000
621
697
767
836
902
966
1027
7500
665
745
822
896
967
1035
1101
8000
710
795
877
955
1031
1104
1174
8500
754
845
932
1015
1096
1173
1248
9000
798
894
986
1057
1160
1242
1321
9500
843
944
1041
1135
1224
1311
1394
10000
887
994
1096
1194
1289
1380
1468
10500
932
1043
1151
1254
1353
1449
1541
11000
976
1039
1205
1314
1418
1518
1615
11500
1020
1143
1260
1373
1482
1587
1688
12000
1065
1192
1315
1433
1547
1656
1761
12500
1109
1242
1370
1493
1611
1725
1835
13000
1153
1292
1452
1553
1676
1794
1908
14000
1242
1391
1534
1672
1804
1932
2055
15000
1331
1490
1644
1791
1933
2070
2202
16000
1419
1590
1753
1911
2062
2208
2349
17000
1508
1689
1863
2030
2191
2346
2495
18000
1597
1788
1973
2105
2320
2484
2642
19000
1686
1888
2082
2269
2449
2622
2789
20000
1774
1987
2192
2388
2578
2760
2936
21000
1863
2087
2301
2508
2707
2898
3082
22000
1952
2186
2411
2627
2836
3036
3229
23000
2040
2285
2521
2747
2964
3174
3376
24000
2129
2385
2630
2866
3093
3312
3523
25000
2218
2484
2740
2986
3222
3450
3670
26000
2307
2583
2849
3105
3351
3588
3816
25000
2218
2484
2740
2986
3222
3450
3670
26000
2307
2583
2849
3105
3351
3588
3816
27000
2395
2683
2959
3224
3480
3726
3963
28000
2484
2782
3069
3344
3609
3864
4110
29000
2573
2881
3178
3463
3738
4002
4257
30000
2661
2981
3288
3583
3867
4140
4404
31000
2750
3080
3397
3702
3996
4278
4550
30000
2661
2981
3288
3583
3867
4140
4404
32000
2839
3180
3507
3822
4124
4416
4697
34000
3016
3378
3726
4060
4382
4692
4991
36000
3194
3577
3945
4299
4640
4968
5284
38000
3371
3776
4164
4538
4898
5544
5578
40000
3549
3974
4384
4777
5156
5520
5871
42000
3762
4173
4603
5016
5413
5796
6165
44000
3903
4372
4822
5255
5671
6072
6458
46000
3780
4320q
4860
5400
5940
6480
7046
130° Rise
MUA-PRC007-EN
DFOA
Table 12. Direct-Fired Outdoor Air (DFOA) unit—Burner selection table (MBh) (continued)
DFOA Model
CFM Std. Air
70°
70° Rise
80° Rise
90° Rise
100° Rise
110° Rise
120° Rise
130° Rise
44000
3903
4372
4822
5255
5671
6072
6458
48000
4258
4769
5260
5732
6187
6624
7046
52000
4273
4883
5494
6104
6715
7325
8807
56000
4968
5564
6317
6688
7218
7728
8220
60000
5323
5962
6575
7165
7733
8280
8807
64000
5678
6359
7014
7643
8249
8832
9394
230
MUA-PRC007-EN
35
DFOA
Dimensions
Figure 12. Single blower sizes 109–130
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit base
11. Manifold
compartment
Front View
Front View
Right Hand Shown
side discharge
bottom discharge
Left is opposite
Table 13. Dimensions for DFOA single blower sizes 109–130
Model
A
B
C
D
E
F
G
H
J
109
36
52
77
17-13/16
10-3/8
15-1/8
14-7/16
11-9/16
19
112
36
52
77
17-13/16
13-9/16
13-9/16
14-7/16
11-9/16
19
115
36
52
77
23-15/16
16
12-3/8
19-7/8
8-5/8
19
118
36
52
77
23-15/16
19
12-3/8
19-7/8
6-15/16
19
120
48
78
96
29-1/2
24-7/8
13-3/16
28-1/4
10-5/32
19
122
48
78
96
29-1/2
27-3/8
13-3/16
28-1/4
11-13/32
19
125
60
91
96
38-7/8
31-3/8
17-9/16
37-3/4
11-13/16
12-5/16
130
60
91
96
38-7/8
36-7/8
17-9/16
37-3/4
14-7/16
12-5/16
Model
K
L
M
P
R
S
T
U
V
109
14-1/4
14-1/2
11-15/16
27-3/4
32
54
20-1/4
42
22
112
14-1/4
12-1/2
15-15/16
27-3/4
32
54
20-1/4
42
22
115
14-1/4
11-1/8
18-15/16
27-3/4
32
54
20-1/4
42
22
118
14-1/4
7-7/8
22-1/16
27-3/4
32
54
20-1/4
42
22
120
14-1/4
12-1/8
25-1/16
48
38-1/2
60
20-1/4
68
22
122
14-1/4
12-3/8
27-9/16
48
38-1/2
60
20-1/4
68
22
125
20-1/4
15-1/8
31-1/2
49
53
65
26-1/2
81
28
130
20-1/4
15-3/8
37
49
53
65
26-1/2
81
28
Note: All dimensions in inches subject to manufacturing tolerances.
36
MUA-PRC007-EN
DFOA
Figure 13. Twin blower sizes 215–230
Unit Components
1. Centrifugal supply
fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
Plan View
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit base
11. Manifold
compartment
Front View
(side discharge)
12. Airflow station
(required ETL listed
Return Air Unit)
Front View
(bottom discharge)
Right Hand Shown
left is opposite
Table 14. Dimensions for DFOA twin blower sizes 215–230
Model
A
B
C
D
E
F
G
H
I
J
215
36
94
77
23-15/16
16
12-3/8
19-7/8
6-15/16
22-1/4
19
218
36
94
77
23-15/16
19
12-3/8
19-7/8
6-15/16
16
19
220
48
130
96
29-7/16
24-7/8
13-3/16
28-1/4
11-7/16
29-5/8
19
222
48
130
96
29-7/16
27-3/8
13-3/16
28-1/4
11-7/16
24-5/8
19
225
60
154
96
38-7/8
31-3/8
17-9/16
37-3/4
14-7/16
37-5/8
12-5/16
230
60
154
96
38-7/8
36-7/8
17-9/16
37-3/4
14-7/16
26-5/8
12-5/16
Model
K
L
M
N
P
R
S
T
U
V
215
14-1/4
7-7/8
18-15/16
14
65-3/4
32
54
20-1/4
84
22
218
14-1/4
7-7/8
22-1/16
14
65-3/4
32
54
20-1/4
84
22
220
14-1/4
12-3/8
25-1/16
22-5/8
87-3/8
44-1/2
60
20-1/4
120
22
222
14-1/4
12-3/8
27-9/16
22-5/8
87-3/8
44-1/2
60
20-1/4
120
22
225
20-1/4
15-3/8
31-1/2
24-5/8
111-3/8
56-1/2
65
26-1/2
144
28
230
20-1/4
15-3/8
37
24-5/8
111-3/8
56-1/2
65
26-1/2
144
28
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
37
DFOA
Figure 14. Twin blower sizes 233 and 240
.
Unit Components
1. Centrifugal supply
fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit base
11. Manifold
compartment
12. Airflow station
(required ETL listed
Return Air Unit)
Front View
Right Hand Side
Front View
(side discharge)
left is opposite
(bottom discharge)
Table 15. Dimensions for DFOA twin blower sizes 233 and 240
Model
A
B
C
D
E
F
G
H
I
J
K
233
68
175
117
43-3/4
43-1/16
19-7/16
44
16-1/16
36
20
20-1/4
240
79-1/4
210
131
55-3/4
41
33
42
19-1/16
39-7/8
20
20-1/4
Model
L
M
N
O
PS
R
S
T
U
V
W
233
17
39-7/8
34-1/8
45
130
56-1/2
70
31-1/4
163
28
72
240
20
53-7/8
38
45
166
51-1/2
70
31-1/4
198
28
86
Note: All dimensions in inches subject to manufacturing tolerances.
38
MUA-PRC007-EN
DFOA
Figure 15. Vertical models sizes 109–130
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit support stand
11. Manifold
compartment
Side view
Front View
Right Hand Shown
Left is opposite
Table 16. Dimensions vertical models sizes 109–130
Model
A
B
C
D
E
F
G
H
J
K
L
M
109
42
52
77
135
10-3/8
15-1/8
22
36
14-1/2
11-15/16
20-1/4
42
112
42
52
77
135
13-9/16
13-9/16
22
36
12-1/2
15-15/16
20-1/4
42
115
42
52
77
135
16
12-3/8
22
36
11-1/8
18-15/16
20-1/4
42
118
42
52
77
135
19
12-3/8
22
36
7-7/8
22-1/16
20-1/4
42
120
56
78
96
166
24-7/8
13-3/16
22
48
12-3/8
25-1/16
20-1/4
68
122
56
78
96
166
27-3/8
13-3/16
22
48
12-3/8
27-9/16
20-1/4
68
125
68
91
96
172
31-3/8
17-9/16
28
48
15-3/8
31-1/2
26-1/2
81
130
68
91
96
172
36-7/8
17-9/16
28
48
15-3/8
37
26-1/2
81
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
39
DFOA
Figure 16. Vertical models sizes 109–130 with mixing box
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit support stand
11. Manifold
compartment
Side View
Front View
Side Discharge
12. Airflow station
(required ETL listed
return air unit)
Right Hand Shown
Left is opposite
Table 17. Dimensions for vertical models sizes 109–130 with mixing box
Model
A
B
C
D
109
42
52
77
167
112
42
52
77
167
115
42
52
77
167
118
42
52
77
120
56
78
122
56
78
125
68
130
68
E
F
G
H
L
M
T
U
10 3/8
15 1/8
54
36
14 1/2
11 15/16
20 1/4
42
13 9/16
13 9/16
54
36
12 1/2
15 15/16
20 1/4
42
16
12 3/8
54
36
11 1/8
18 15/16
20 1/4
42
167
19
12 3/8
54
36
7 7/8
22 1/16
20 1/4
42
96
204
24 7/8
13 3/16
60
48
12 3/8
25 1/16
20 1/4
68
96
204
27 3/8
13 3/16
60
48
12 3/8
27 9/16
20 1/4
68
91
96
209
31 3/8
17 9/16
65
48
15 3/8
31 1/2
26 1/2
81
91
96
209
36 7/8
17 9/16
65
48
15 3/8
37
26 1/2
81
Note: All dimensions in inches subject to manufacturing tolerances.
40
MUA-PRC007-EN
DFOA
Figure 17. Vertical models sizes 215–230
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit support stand
11. Manifold
compartment
Side View
Front View
12. Airflow station
(required ETL listed
return air unit)
(side discharge)
Right Hand Shown
left is opposite
Table 18. Dimensions for vertical models sizes 215-230
Model
A
B
C
D
E
F
G
H
I
J
215
42
94
77
135
16
12-3/8
22
36
22-1/4
19
218
42
94
77
135
19
12-3/8
22
36
16
19
220
56
130
96
166
24-7/8 13-3/16
22
48
29-5/8
19
222
56
130
96
166
27-3/8 13-3/16
22
48
24-5/8
19
225
68
154
96
172
31-3/8 17-9/16
28
48
230
68
154
96
172
36-7/8 17-9/16
28
48
K
L
M
P
14-1/4
7-7/8
18-15/16
65-3/4
14-1/4
7-7/8
22-1/16
65-3/4
14-1/4
12-3/8
25-1/16
87-3/8
14-1/4
12-3/8
27-9/16
87-3/8
37-5/8 12-5/16 20-1/4
15-3/8
31-1/2
111-3/8
26-5/8 12-5/16 20-1/4
15-3/8
37
111-3/8
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
41
DFOA
Figure 18. Vertical models sizes 215–230 with mixing box
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
SEPERATE HERE
FOR SHIPPING
5. Hinged control cabinet
access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
Front View
(side discharge)
10. Unit support stand
Side View
11. Manifold compartment
Right Hand Shown
12. Airflow station (required ETL
listed return air unit)
Left is opposite
Table 19. Dimensions for vertical models sizes 215–230 with mixing box
Model
A
B
C
D
E
F
G
H
I
L
M
T
U
215
42
94
77
167
16
12-3/8
54
36
22-1/4
7-7/8
18-15/16
20-1/4
84
218
42
94
77
167
19
12-3/8
54
36
16
7-7/8
22-1/16
20-1/4
84
220
56
130
96
204
24-7/8
13-3/16
60
48
29-5/8
12-3/8
25-1/16
20-1/4
120
222
56
130
96
204
27-3/8
13-3/16
60
48
24-5/8
12-3/8
27-9/16
20-1/4
120
225
68
154
96
209
31-3/8
17-9/16
65
48
37-5/8
15-3/8
31-1/2
26-1/2
144
230
68
154
96
209
36-7/8
17-9/16
65
48
26-5/8
15-3/8
37
26-1/2
144
Note: All dimensions in inches subject to manufacturing tolerances.
42
MUA-PRC007-EN
DFOA
Figure 19. Vertical models sizes 233 and 240
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit support stand
11. Manifold
compartment
Front View
Side View
(side discharge)
Right Hand Shown
Left is opposite
Table 20. Dimensions vertical models sizes 233 and 240
Model
A
B
C
D
233
76
175
117
205
240
87-1/4
210
131
219
E
F
43-1/16 19-7/16
41
33
I
J
K
L
M
O
P
W
36
20
20-1/4
17
39-7/8
45
130
72
39-7/8
20
20-1/4
20
53-7/8
45
166
86
Note: All dimensions in inches subject to manufacturing tolerances.
MUA-PRC007-EN
43
DFOA
Figure 20. Vertical models 233 and 240 with mixing box
Unit Components
1. Centrifugal supply fan
2. Fan motor
3. Line burner
4. Control cabinet
5. Hinged control
cabinet access door
6. Observation port
7.
Access door
8. Access door (piping
compartment)
9. Lifting lug
10. Unit support stand
11. Manifold
compartment
Front View
Side View
(side discharge)
Right Hand Shown
Left is opposite
Table 21. Dimensions for vertical models 233 and 240 with mixing box
Model
A
B
C
D
E
F
I
L
M
T
U
W
233
76
175
117
247
43-1/16
19-7/16
36
17
39-7/8
31-1/4
163
72
240
87-1/4
210
131
261
41
33
39-7/8
20
58-7/8
31-1/4
198
86
Note: All dimensions in inches subject to manufacturing tolerances.
44
MUA-PRC007-EN
DFOA
Figure 21. DFOA Accessories dimensional data
Table 22. DFOA Accessories dimensional data
Model
A
B
109–112
3’ 0”
3’ 11-1/4”
914
1200
3’ 0”
3’ 11-1/4”
914
1200
581
684
3’ 0”
7’ 7-1/2”
1’ 10-7/8”
914
2324
581
115–118
215–218
220–222
225–230
C
D
E
F
G
H
J
K
L
M
1’ 10”
5’ 1-3/4”
2’ 8-1/4”
3’ 7-1/8”
1’ 9”
1’ 11”
4’ 4”
4’ 6”
559
1568
819
1095
533
584
1321
1372
1’ 10”
5’ 1-3/4”
2’ 8-1/4”
3’ 7-1/8”
2’ 0”
1’ 11”
4’ 4”
4’ 6”
559
1568
819
1095
610
660
1321
1372
5’ 4-7/8”
1’ 10”
5’ 1-3/4”
2’ 8-1/4”
7’ 3-3/8”
2’ 0”
1’ 11”
7’ 10”
4’ 6”
1648
559
1568
819
2219
610
660
2388
1372
1’ 5-7/16” 1’ 8-13/16”
443
529
1’ 10-7/8” 2’ 2-15/16”
4’ 0”
8’ 5-5/8”
2’ 7-1/4”
7’ 0-1/2”
1’ 10”
5’ 5-3/4”
3’ 8-1/4”
8’ 1-1/2”
3’ 9”
2’ 7”
10’ 10”
5’ 0”
1219
2581
794
2146
559
1670
1124
2477
1143
787
3302
1524
5’ 0”
10’ 1-3/8”
3’ 4-3/4”
8’ 9-3/8”
2’ 4”
7’ 2-1/8”
4’ 8-1/4”
9’ 9-1/4”
3’ 9”
3’ 4-3/4”
12’ 10”
5’ 5”
1524
3083
1035
2677
711
2188
1429
2978
1143
1035
3912
1651
MUA-PRC007-EN
Model
R / A / ID
109–118
3’ 6” x 1’ 8-1/4” (1067 x 514)
215–218
7’ x 1’ 8-1/4” (2134 x 514)
220–222
0’ x 1’ 8-1/4” (3048 x 514)
225–230
12’ x 2’ 2-1/2” (3658 x 673)
45
DFOA
Roof curbs for 100% make-up air units
Figure 22. Single blower roof curb dimensions
Table 23. Dimensions for single blower roof curb model sizes 109–118
46
Model
A
B
C
D
E
109
10-3/8”
1’ 0-3/8”
11-15/16”
11-3/4”
1’ 10-13/16”
264
314
303
298
579
112
1’ 1-9/16”
10-13/16”
1’ 3-15/16”
9-3/4”
1’ 8-13/16”
344
275
405
248
529
115
1’ 4”
9-5/8”
1’ 6-15/16”
8-3/8”
1’ 7-3/16”
406
244
481
213
487
118
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 7-5/16”
483
244
560
130
491
MUA-PRC007-EN
DFOA
Roof curbs for 100% make-up air units
Figure 23. Double blower roof curb dimensions
Table 24. Double blower roof curb dimensions for model sizes 215–230
Model
A
B
C
D
E
F
G
H
J
K
215
1’ 4”
9-5/8”
1’ 6-15/16”
5-1/8”
1’ 10-1/4”
406
244
481
130
565
1’ 11-1/4”
6’ 3”
591
1905
5’ 11-1/2”
7’ 8”
7’ 4-1/2”
1816
2337
218
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 4”
1’ 11-1/4”
6’ 3”
2248
5’ 11-1/2”
7’ 8”
7’ 4-1/2”
483
244
560
130
406
591
1905
1816
2337
2248
220
2’ 0-7/8”
10-7/16”
2’ 1-1/16”
9-5/8”
2’ 5-5/8”
2’ 11-1/8”
7’ 10”
7’ 6-1/2”
10’ 8”
10’ 4-1/2”
632
265
637
244
752
892
2388
2299
3251
3162
222
2’ 3-3/8”
10-7/16”
2’ 3-9/16”
9-5/8”
2’ 0-5/8”
2’ 11-1/8”
7’ 10”
7’ 6-1/2”
10’ 8”
10’ 4-1/2”
695
265
700
244
625
892
2388
2299
3251
3162
225
2’ 7-3/8”
1’ 2-13/16”
2’ 7-1/2”
1’ 0-5/8”
3’ 1-5/8”
2’ 11-1/4”
7’ 10”
7’ 6-1/2”
12’ 8”
12’ 4-1/2”
797
376
800
321
956
895
2388
2299
3861
3772
230
3’ 0-7/8”
1’ 2-13/16”
3’ 1”
1’ 0-5/8”
2’ 2-5/8”
2’ 11-1/4”
7’ 10”
7’ 6-1/2”
12’ 8”
12’ 4-1/2”
937
376
940
321
676
895
2388
2299
3861
3772
Notes:
1. Curb to be shipped loose and assembled in the field.
2. Curb must be square and level
3. Curb requires intermediate structural support and is not to be corner post mounted.
4. Gaskets to be shipped with unit.
5. Bolting accessories shipped with curb.
6. Curb drawings shown are for units which have controls on the “standard” side.
7. Available on horizontal units only.
MUA-PRC007-EN
47
DFOA
Roof curbs for units with return air opening downsteam of burner
Figure 24. Roof curb dimensions for single blower models sizes 109–118
Table 25. Dimensions for roof curb single blower models sizes 109–118
Model
A
B
C
D
E
109
10-3/8”
1’ 0-3/8”
11-15/16”
11-3/4”
1’ 10-13/16”
264
314
303
298
579
1’ 1-9/16”
10-13/16”
1’ 3-15/16”
9-3/4”
1’ 8-13/16”
344
275
405
248
529
1’ 4”
9-5/8”
1’ 6-15/16”
8-3/8”
1’ 7-3/16”
406
244
481
213
487
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 7-5/16”
483
244
560
130
491
112
115
118
48
MUA-PRC007-EN
DFOA
Roof curbs for units with return air opening downstream of burner
Figure 25. Roof curb dimensions for double blower models sizes 215–230
Table 26. Roof curb dimensions for double blower models sizes 215–230
Model
A
B
C
D
E
F
G
215
1’ 4”
9-5/8”
1’ 6-15/16”
5-1/8”
1’ 10-1/4”
1’ 11-1/4”
6’ 3”
406
244
481
130
565
591
1905
218
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 4”
1’ 11-1/4”
6’ 3”
483
244
560
130
406
591
1905
2’ 0-7/8”
10-7/16”
2’ 1-1/16”
9-5/8”
2’ 5-5/8”
2’ 11-1/8”
7’ 10”
632
265
637
244
752
892
2388
2’ 3-3/8”
10-7/16”
2’ 3-9/16”
9-5/8”
2’ 0-5/8”
2’ 11-1/8”
7’ 10”
695
265
700
244
625
892
2388
225
2’ 7-3/8”
1’ 2-13/16”
2’ 7-1/2”
1’ 0-5/8”
3’ 1-5/8”
2’ 11-1/4”
7’ 10”
797
376
800
321
956
895
2388
230
3’ 0-7/8”
1’ 2-13/16”
3’ 1”
1’ 0-5/8”
2’ 2-5/8”
2’ 11-1/4”
7’ 10”
937
376
940
321
676
895
2388
220
222
MUA-PRC007-EN
Model
H
J
K
L
M
W
215
5’ 11-1/2”
7’ 8”
7’ 4-1/2”
5’ 5-3/4”
1’ 4-1/4”
1’ 2-1/4”
1816
2337
2248
1670
413
362
218
5’ 11-1/2”
7’ 8”
7’ 4-1/2”
5’ 5-3/4”
1’ 4-1/4”
1’ 2-1/4”
1816
2337
2248
1670
413
362
220
7’ 6-1/2”
10’ 8”
10’ 4-1/2”
7’ 3-3/8”
1’ 4-1/4”
1’ 2-1/4”
2299
3251
3162
2219
413
362
222
7’ 6-1/2”
10’ 8”
10’ 4-1/2”
7’ 3-3/8”
1’ 4-1/4”
1’ 2-1/4”
2299
3251
3162
2219
413
362
225
7’ 6-1/2”
12’ 8”
12’ 4-1/2”
9’ 3-3/8”
9-9/16”
1’ 8-1/4”
2299
3861
3772
2829
243
514
230
7’ 6-1/2”
12’ 8”
12’ 4-1/2”
9’ 3-3/8”
9-9/16”
1’ 8-1/4”
2299
3861
3772
2829
243
514
49
DFOA
Roof curbs for units with mixing box
Figure 26. Roof curb dimensions for single blower units with mixing box
Table 27. Roof curb dimensions for single blower units with mixing box models sizes 109–118
Model
A
B
C
D
E
109
10-3/8”
1’ 0-3/8”
11-15/16”
11-3/4”
1’ 10-13/16”
264
314
303
298
579
1’ 1-9/16”
10-13/16”
1’ 3-15/16”
9-3/4”
1’ 8-13/16”
344
275
405
248
529
1’ 4”
9-5/8”
1’ 6-15/16”
8-3/8”
1’ 7-3/16”
406
244
481
213
487
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 7-5/16”
483
244
560
130
491
112
115
118
50
MUA-PRC007-EN
DFOA
Roof curbs for units with mixing boxes
Figure 27. Roof curb dimensions for double blower units with mixing box
Table 28. Roof curb dimensions for double blower units with mixing box models sizes 215–230
Model
A
B
C
D
215
1’ 4”
9-5/8”
1’ 6-15/16”
5-1/8”
406
244
481
130
565
591
218
1’ 7”
9-5/8”
1’ 10-1/16”
5-1/8”
1’ 4”
1’ 11-1/4”
483
244
560
130
406
591
3277
3188
2337
2248
514
2134
220
2’ 0-7/8”
10-7/16”
2’ 1-1/16”
9-5/8”
2’ 5-5/8”
2’ 11-1/8”
12’ 10”
12’ 6-1/2”
10’ 8”
10’ 4-1/2”
1’ 8-1/4”
10’ 0”
632
265
637
244
752
892
3912
3823
3251
3162
514
3048
222
2’ 3-3/8”
10-7/16”
2’ 3-9/16”
9-5/8”
2’ 0-5/8”
2’ 11-1/8”
12’ 10”
12’ 6-1/2”
10’ 8”
10’ 4-1/2”
1’ 8-1/4”
10’ 0”
695
265
700
225
2’ 7-3/8” 1’ 2-13/16” 2’ 7-1/2”
230
3’ 0-7/8” 1’ 2-13/16”
797
937
376
376
E
F
1’ 10-1/4” 1’ 11-1/4”
G
H
J
K
L
M
10’ 9”
10’ 5-1/2”
7’ 8”
7’ 4-1/2”
1’ 8-1/4”
7’ 0”
3277
3188
2337
2248
514
2134
10’ 9”
10’ 5-1/2”
7’ 8”
7’ 4-1/2”
1’ 8-1/4”
7’ 0”
244
625
892
3912
3823
3251
3162
514
3048
1’ 0-5/8”
3’ 1-5/8”
2’ 11-1/4”
13’ 3”
12’ 11-1/2”
12’ 8”
12’ 4-1/2”
2’ 2-1/2”
12’ 0”
800
321
956
895
4039
3950
3861
3772
673
3658
3’ 1”
1’ 0-5/8”
2’ 2-5/8”
2’ 11-1/4”
13’ 3”
12’ 11-1/2”
12’ 8”
12’ 4-1/2”
2’ 2-1/2”
12’ 0”
940
321
676
895
4039
3950
3861
3772
673
3658
Notes:
1. Curb to be shipped loose and assembled in the field.
2. Curb must be square and level.
3. Curb requires intermediate structural support and is not to be corner post mounted.
4. Gaskets to be shipped with unit.
5. Bolting accessories shipped with curb.
6. Curb drawings shown are for units which have controls on the “standard” side.
7. Available on horizontal units only.
MUA-PRC007-EN
51
DFOA
Approximate weights
Table 29. Unit weights in pounds (approximate)
Unit
Size
Basic
Horizontal
Unit
Basic
Vertical Inlet
Unit
Hood
109
760
984
170
75
105
480
112
760
984
170
75
105
480
115
760
984
170
75
105
118
810
1034
170
75
215
1180
1607
275
218
1300
1727
275
220
2280
3179
222
2370
225
230
Inlet
Damper
V-bank Mixing Air Flow
Filter
Box
Station
Discharge
Damper
Discharge
Louver
A
B
C
D
47
30
70
215
215
185
145
47
30
70
215
215
185
145
480
47
30
70
215
215
185
145
105
480
47
30
70
225
225
200
160
135
175
700
80
100
150
342
342
274
222
135
175
700
80
100
150
378
378
311
233
320
200
230
980
111
145
215
625
625
555
475
3269
320
200
230
980
111
145
215
675
675
545
475
2990
4135
500
275
340
1270
135
210
230
824
824
732
610
3130
4275
720
275
340
1270
135
210
230
863
863
731
673
230
Table 30. Roof curb weights in pounds
Unit Sizes
Description
109
112
115
118
215
218
220
222
225
Roof Curb for Basic Frame—No Return Air
150
150
150
150
200
200
270
270
300
300
Roof Curb for Basic Frame—With Return Air Downstream of Burner
150
150
150
150
200
200
270
270
300
300
Roof Curb for Basic Frame—With Mixing Box Option
215
215
215
215
270
270
340
340
375
375
52
MUA-PRC007-EN
DFOA
Figure 28. Inlet hood support (by others)
Inlet Hood Support (By Others)
•
The purpose of hood support is to support the weight of the unit accessories which are attached
to the inlet of the basic unit.
•
The hood support can be made from two, 2” x 2” x 1/4” angle iron.
•
One angle iron support should be located in, or close to, the outer corners of the hood. The
supports can be bolted to the hood.
•
The bottom of the angle iron support should be fitted with a base. The base can sit on the roof
and does not have to be fixed to the roof. An isolation pad may be put between the base and
the roof.
Model
A
B
C
109–112
3’ 0”
3’ 11-1/4”
1’ 5-7/16”
914
1200
443
115–118
3’ 0”
3’ 11-1/4”
1’ 10-7/8”
914
1200
581
215–218
3’ 0”
7’ 7-1/2”
1’ 10-7/8”
914
2324
581
220–222
4’ 0”
8’ 5-5/8”
2’ 7-1/4”
225–230
MUA-PRC007-EN
1219
2581
794
5’ 0”
10’ 1-3/8”
3’ 4-3/4”
1524
3083
1035
53
Gas Piping
Figure 29. Gas piping
Table 31. Gas piping component identification
GP-01
High Gas Pressure Regulator
VG-03
GP-02
Main Gas Shut-off Valve
VG-04
Auxiliary Gas Valve
N/O Vent Valve
GP-09
Pilot Gas Pressure Regulator
VG-07
Modulating Valve
GP-11
Main Test Firing Shut-off Valve
PS-04
Low Gas Pressure Switch
GP-13
Pilot Gas Shut-off Valve
PS-07
High Gas Pressure Switch
GP-27
Orificed Needle Valve
PS-10
High Velocity Pressure Switch
VG-01
Pilot Gas Valve
PS-11
Low Velocity Pressure Switch
VG-02
Main Gas Valve
Notes:
1. Vent limiting devices provided wherever possible, when venting is required; the venting to outside is by others on indoor
units and furnished by factroy on outdoor units.
2. Units with 900 MBh and less use a pressure regulator (not shown) for high fire setting.
3. 3,300 MBh and above will require a minimum inlet pressure of 1 psig. For inlet pressures under 1 psig, please consult
factory.
4. Units that are listed to the Z83.4 standard (100% Make-Up Air) carry both ETL and CETL approvals.
5. Standard manifold meets FM requirements for inputs under 2,500 MBh for ETL listed units
6. Standard manifold meets IRI requirements for ETL listed units.
7. High gas pressure regulator required if inlet pressure exceeds 1/2 psig for inputs up to and including 900 MBh or inlet
pressures over 5 psig for inputs greater than 900 MBh.
54
MUA-PRC007-EN
Gas Piping
Table 32. Gas pressure regulator selection
If Burner Size (BS) Is:
And Gas Pressure (GP) Is:
BS < 2200
GP < 7 in. wc
Call factory to verify availability and pricing
7 in. wc < GP < 10 in. wc
Use low gas pressure burner
10 in. wc < GP < 14 in. wc
No high gas pressure regulator required
2475 < BS < 3025
3300 < BS < 9075
Then:
14 in. wc < GP <1 psi
Use high gas pressure regualtor 14 in. wc – 1 psi (shipped loose)
1 psi < GP < 5 psi
Use high gas pressure regulator 1–5 psi (shipped loose)
5 psi < GP < 10 psi
Use high gas pressure regulator 5–10 psi (shipped loose)
10 psi < GP < 50 psi
Use high gas pressure regulator over 10 psi (shipped loose)
50 psi < GP
Call factory to verify availability and pricing
GP < 10 in. wc
Call factory to verify availability and pricing
10 in. wc < GP < 14 in. wc
No high gas pressure regulator required
14 in. wc < GP < 1 psi
Use high gas pressure regualtor 14 in. wc – 1 psi (shipped loose)
1 psi < GP < 5 PSI
Use high gas pressure regulator 1–5 psi (shipped loose)
5 psi < GP < 10 psi
Use high gas pressure regulator 5–10 psi (shipped loose)
10 psi < GP < 50 psi
Use high gas pressure regulator over 10 psi (shipped loose)
50 psi < GP
Call factory to verify availability and pricing
GP < 1 psi
Call factory to verify availability and pricing
1 psi < GP < 5 psi
No high gas pressure regulator required
5 psi < GP < 10 psi
Use high gas pressure regulator 5–10 psi (shipped loose)
10 psi < GP < 50 psi
Use high gas pressure regulator over 10 psi (shipped loose)
50 psi < GP
Call factory to verify availability and pricing
Examples of how to read the above:
MUA-PRC007-EN
•
GP < 7 in. wc: Gas pressure less than 7 in. wc
•
7 in. wc < GP < 10 in. wc: Gas pressure greater than or equal to 7 in. wc, and less than 10 in. wc
•
10 in. wc < GP < 14 in. wc: Gas pressure greater than or equal to 10 in. wc, and less than or equal
to 14 in. wc
•
50 psi < GP: Gas pressure greater than 50 psi
55
Gas Piping
Table 33. Gas piping connection size, standard gas train
Inlet gas pressure (inches of water column)
MBh
56
7
8–11
12–14
15–20
21–27
1 psi
2 psi
3 psi
4 psi
5 psi
275
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
550
1-1/4
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
825
2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,100
2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,375
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,650
—
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,925
—
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,200
—
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,475
—
2
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,750
—
2
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
3,025
—
—
2
2
2
2
2
2
2
2
3,300
—
—
2
2
2
2
2
2
2
2
3,575
—
—
—
—
2
2
2
2
2
2
3,850
—
—
—
—
2
2
2
2
2
2
4,125
—
—
—
—
2
2
2
2
2
2
4,400
—
—
—
—
2
2
2
2
2
2
4,675
—
—
—
—
2
2
2
2
2
2
4,950
—
—
—
—
2
2
2
2
2
2
5,225
—
—
—
—
2
2
2
2
2
2
5,500
—
—
—
—
2
2
2
2
2
2
5,775
—
—
—
—
2
2
2
2
2
2
6,050
—
—
—
—
2
2
2
2
2
2
6,325
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,600
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,875
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,150
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,700
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
8,250
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
8,800
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
9,350
—
—
—
—
3
3
3
3
3
3
MUA-PRC007-EN
Gas Piping
Table 34. Gas pipe connection size, FM gas train
Inlet gas pressure (inches of water column)
MBh
7
8–11
12–14
15–20
21–27
1 psi
2 psi
3 psi
4 psi
5 psi
275
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
550
1-1/4
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
825
1-1/4
1-1/4
1
1
3/4
—
—
—
—
—
1,100
1½
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,375
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,650
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,925
2
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,200
—
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,475
—
2
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,750
—
2-1/2
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
3,025
—
3
2
—
—
—
—
—
—
—
3,300
—
3
2-1/2
2
2
2
2
2
2
2
3,575
—
—
—
—
—
2
2
2
2
2
3,850
—
—
—
—
—
2
2
2
2
2
4,125
—
—
—
—
—
2
2
2
2
2
4,400
—
—
—
—
—
2
2
2
2
2
4,675
—
—
—
—
—
2
2
2
2
2
4,950
—
—
—
—
—
2
—
—
—
—
5,225
—
—
—
—
—
2
—
—
—
—
5,500
—
—
—
—
—
2
—
—
—
—
5,775
—
—
—
—
—
2
—
—
—
—
6,050
—
—
—
—
—
2
—
—
—
—
6,325
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,600
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,875
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,150
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,700
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
8,250
—
—
—
—
—
2-1/2
—
—
—
—
8,800
—
—
—
—
—
2-1/2
—
—
—
—
9,350
—
—
—
—
—
3
3
3
3
3
MUA-PRC007-EN
57
Gas Piping
Table 35. Gas pipe connection size, IRI gas train
Inlet gas pressure (inches of water column)
58
MBh
7
8–11
12–14
15–20
21–27
1 psi
2 psi
3 psi
4 psi
5 psi
275
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
550
1-1/4
1
3/4
3/4
3/4
3/4
3/4
3/4
3/4
3/4
825
1-1/4
1-1/4
3/4
3/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,100
2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,375
2-1/2
2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,650
2-1/2
2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1,925
2-1/2
2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,200
2-1/2
2
1-1/2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,475
—
2
1-1/2
1-1/2
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
2,750
—
2-1/2
2
1-1/2
—
1-1/4
1-1/4
1-1/4
1-1/4
1-1/4
3,025
—
2-1/2
2
—
—
—
—
—
—
—
3,300
—
2-1/2
2
2
2
2
2
2
2
2
3,575
—
—
—
—
—
2
2
2
2
2
3,850
—
—
—
—
—
2
2
2
2
2
4,125
—
—
—
—
—
2
2
2
2
2
4,400
—
—
—
—
—
2
2
2
2
2
4,675
—
—
—
—
—
2
2
2
2
2
4,950
—
—
—
—
—
2
2
2
2
2
5,225
—
—
—
—
—
2
2
2
2
2
5,500
—
—
—
—
—
2
2
2
2
2
5,775
—
—
—
—
—
2
—
—
—
—
6,050
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,325
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,600
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
6,875
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,150
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
7,700
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
8,250
—
—
—
—
—
2-1/2
2-1/2
2-1/2
2-1/2
2-1/2
8,800
—
—
—
—
—
2-1/2
—
—
—
—
9,350
—
—
—
—
—
3
3
3
3
3
MUA-PRC007-EN
Electrical Power
Table 36. Motor electrical data
Single Phase
Three Phase
hp
115
208
230
208
230
460
1/3
7.2
4
3.6
1.4
1.6
0.7
1/2
9.8
5.4
4.9
2.4
2.2
1.1
3/4
13.8
7.6
6.9
3.5
3.2
1.6
1
16
8.8
8
4.6
4.2
2.1
1-1/2
20
11
10
6.6
6
3
3.4
2
24
13.2
12
7.5
6.8
3
34
18.7
17
10.6
9.6
4.8
5
56
30.8
28
16.7
15.2
7.6
7-1/2
—
—
—
24.2
22
11
10
—
55
—
30.8
28
14
15
—
—
—
46.2
42
21
20
—
—
—
59.4
54
27
25
—
—
—
74.8
68
34
30
—
—
—
88
80
40
40
—
—
—
114
104
52
50
—
—
—
143
130
65
60
—
—
—
169
154
77
Notes:
1. Amps taken from table 430-148 (single phase) and 430-150(three phase) of the 2002 edition of NEC. Actual motor amps
are dependent on motor type and will be on name plate.
2. For units without a service receptacle: MCA = (Motor FLA*1.25) + (500VA transformer amps)
3. For units with a service receptable: MCA = (Motor FLA*1.25) + (500VA transformer amps) + (1000VA transformer amps)
Table 37. Primary voltage
MUA-PRC007-EN
115
208
230
460
500 VA
4.3
2.4
2.2
460
1000 VA
8.6
4.8
4.3
2.2
59
Options
Motorized 75/25 Damper
Purpose
To provide a way for recirculating return air and letting building pressure control the amount of air
which is recirculated.
Operation
If building pressure is less than desired, the RA damper modulates to a more closed position and
the interlocked burner profile damper modulates to a more open position. More OA is brought into
building.
If building pressure is greater than desired, the RA damper modulates to a more open position and
the interlocked burner profile damper modulates to a more closed position. Less OA is brought into
building.
At no time will the unit provide less than 25 percent OA to the building. In general terms, the
minimum OA is 25 percent; however, there are cases where it can be as high as 40–50 percent,
depending upon unit size, burner size, gas train type and gas pressure.
Code requires that outside ventilation air be provided to the space in the amount of 4 cfm per 1 MBh
of burner rated input.
All units are provided with a means that will allow the customer to interlock OA fans when the
amount of OA provided by the unit is not sufficient to meet the 4 cfm per 1 MBh requirement.
Notes:
•
•
This option can be used with either the Motorized Inlet Damper option or the Motorized Outlet
Damper option.
Option Includes:
•
Return air section with damper
•
Burner profile damper
•
Linkage
•
Modulating damper motor(s)
•
Photohelic differential pressure gauge
Figure 30. Motorized 75/25 damper
60
MUA-PRC007-EN
Options
Mixing Box—Temperature Control
Purpose
To provide a way for recirculating return air and letting mixed air temperature determine the
amount of OA/RA.
Operation
A temperature sensor located after the V-bank filter modulates the OA and RA dampers to maintain
a set temperature.
If temperature at sensor is cooler than setting, OA damper modulates to a more closed position,
and RA damper modulates to a more open position.
If temperature at sensor is warmer than setting, OA damper modulates to a more open position,
and RA damper modulates to a more closed position.The minimum OA damper position is factory
set at 25 percent supply air.
The desired temperature at the temperature sensor is set at the control cabinet at the unit.
Option Includes:
•
Inlet damper
•
Return air section with damper
•
Modulating damper motor(s)
•
V-bank filter with throwaway filters (DFIA)/Permanent (DFOA)
•
Temperature sensor
Figure 31. Mixing box—Temperature control
Mixing Box—Manual Control
Purpose
To provide a way for recirculating return air and using manual control to determine the amount of
OA/RA.
Operation
A manual potentiometer located at the remote control station determines the OA/RA setting. The
minimum OA damper position is factory set with a potentiometer. The minimum OA damper
opening is set at 4 cfm per 1 MBh of burner rated input, or 25 percent supply air, whichever is larger.
Options Include:
•
MUA-PRC007-EN
Mixing box with V-bank filter and permanent filters (DFOA)/TA (DFIA)
61
Options
•
Dampers
•
Modulating damper motor(s)
•
Manual potentiometerRemote control station not included.
Figure 32. Mixing box—Manual control
Purpose
To provide a way for recirculating return air and using manual control to determine the amount of
OA/RA.
Operation
A manual potentiometer located at the remote control station determines the OA/RA setting. The
minimum OA damper position is factory set with a potentiometer. The minimum OA damper
opening is set at 4 cfm per 1 MBh of burner rated input, or 25 percent supply air, whichever is larger.
Options Include:
•
Mixing box with V-bank filter and permanent filters (DFOA)/TA (DFIA)
•
Dampers
•
Modulating damper motor(s)
•
Manual potentiometer
Note: Remote control station not included.
62
MUA-PRC007-EN
Options
Mixing Box—Building Pressure Control
Purpose
To provide a way for recirculating return air and letting building pressure control the amount of air
which is recirculated.
Operation
If building pressure is less than desired, the RA damper modulates to a more closed position and
the OA damper modulates to a more open position. More OA is brought into building.
If building pressure is greater than desired, the RA damper modulates to a more open position and
the OA damper modulates to a more closed position. Less OA is brought into building.
The minimum OA damper position is factory set with a potentiometer. The minimum OA damper
position is set at 4 cfm per 1 MBh of burner rated input, or 25 percent supply air, whichever is larger.
The desired pressure differential is set at the photohelic.
Options Include:
•
Mixing box with V-bank filter and permanent filters (DFOA)/TA (DFIA)
•
Dampers
•
Modulating damper motor(s)
•
Photohelic differential pressure gauge
Figure 33. Mixing box—Building pressure control
Motorized Inlet Damper
Purpose
To provide a shut-off damper.
Operation
When the fan switch is on, the inlet damper begins to open. As the inlet damper approaches the
full open position, a built-in end switch located inside the damper motor closes. The closed end
switch starts the fan motor. When the fan switch is turned to the “off” position, or if there is a power
failure, the inlet damper closes.
MUA-PRC007-EN
63
Options
Option Includes:
•
Damper
•
Two position damper motor(s) with built-in end switch and spring return
•
Linkage
Figure 34. Motorized inlet damper
Exhaust Interlock
The exhaust interlock is a pair of contacts on the unit that will close when the unit is “on.” The
customer can wire the exhaust fan to the contacts so that when the heating unit is “on,” the exhaust
fan will also be “on.” Note the heating unit turns on the exhaust fan.
The auxiliary contacts on the fan motor starter are the contacts which are used as the exhaust
interlock. The auxiliary contacts are wired to the numbered terminal strip. The customer can wire
the indicated terminals into the control circuit of the exhaust fan.
Note: If the customer wants the exhaust fan to turn the heating unit “on,” he/she has to provide
a pair of contacts that will close when the exhaust fan is “on.”
Interlocking Relay
The interlocking relay is two pair of contacts, one normally open and the other normally closed.
The contacts switch positions when the unit is “on.” The contacts are wired to the numbered
terminal strip. The customer can wire a wide range of devices to the interlocking relay by wiring
to the indicated terminals.
Seven-Day Timeclock/Night Setback Thermostat
The seven-day timeclock is used primarily for either one of the following:
1. Start and stop the unit at preset times.
Example: A building is occupied at 8:00 AM. At 4:30 PM, people leave the building. The
timeclock could be set to turn the unit on at 7:30 AM and off at 5:00 PM.
2. The timeclock can be used with an on-off night setback thermostat (NSB thermostat. The
timeclock and NSB thermostat would be wired so that during the night, the NSB thermostat
would turn the unit on and off.
Example: Same as example above, only at 5:00 PM the NSB thermostat would turn the unit on
and off. If the temperature in the space fell below the setting of the NSB thermostat, the unit
would come “on.” If the temperature rose above the setting, the unit would go “off.”
Inlet On-Off Duct Stat
Automatically turns burner off when inlet air temperature equals setting of control. Works as a
lockout for the burner.
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Options
Example: If we want the burner to be “off” if the entering air temperature is 65 degrees, the inlet
on-off duct stat would be set at 65 degrees.
Without the inlet on-off duct stat, if the fan switch and heat switch are both “on,” no matter how
warm the incoming air, the burner will go as low as low fire, but will not go “off.”
UV Flame Sensor (UV Mini-Peeper)
Flame sensor checks to make sure the pilot flame has ignited before gas is sent to the main burner.
Operates by sensing the light of the pilot flame.
If the flame sensor does not sense the pilot flame, the unit shuts down (fan and burner go off) and
the flame failure light on the optional remote panel goes on.
The unit has to be reset by pushing the reset button on the burner relay.
Differences between UV Flame Sensor and Flame Rod:
Both are used for the same purpose — to check if the pilot flame is on. The flame rod is “standard.”
The UV sensor needs to be ordered as an option.
If condensation forms on the flame rod while the unit is off, it may give a false signal and prevent
the unit from coming on. The wet flame rod does not sense the pilot flame and shuts the unit down.
This nuisance tripping can be avoided with the UV flame sensor.
Optional Gas Controls
Constant Discharge Temperature
The constant discharge temperature, gas modulating control system consists of electronic gas
modulating system (40°F to 90°F range), which includes a discharge air sensor located in the blower
discharge, a modulator/regulator valve mounted in the gas piping manifold, an amplifier installed
in the electrical control panel, a 115 to 24 volt transformer, and a remote temperature selector.
Series 44 — Space Temperature Control
The space temperature control, gas modulating control system consists of the Maxitrol electronic
gas modulating system, which includes a Series 44 discharge air sensor (55°F to 90°F range)
mounted in the blower discharge, a modulator regulator valve mounted in the gas piping manifold,
an amplifier installed in the electric control panel, a 115 volt to 24 volt transformer, and a
Selectrastat mounted in the area where the temperature is to be sensed.
Factory Installed Options
Motors—General
All motors are provided as standard, with a starter for external overload protection, a control
transformer, and an on-fused disconnect switch.
Open Drip-Proof Motor, 60 Hz/1800 Rpm
Single Phase
Optional 115V motors are available in 3/4 hp to 3 hp models. Optional 208V motors are available
in 3/4 hp to 7-1/2 hp models. Optional 230V motors are available in 3/4 hp to 10 hp models. All
motors have rigid base construction and ball bearings. Class A insulation is on all motors up to and
including 3 hp models. Class B insulation is on 5 hp and above models.
Three-Phase
Optional 208V, 230V, 460V available in 1 hp to 60 hp models. All models have rigid base
construction and ball bearings. Class B insulation is on all three-phase motors.
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Options
Energy Efficient ODP 60 Hz/1800 Rp Three-Phase Only
Optional 208V motors are available in 1 hp to 30 hp models. 230V and 460V motors are available
in 1 hp to 60 hp models. All motors have rigid base construction and ball bearings. Class B
insulation is on all motors.
Totally Enclosed Motor, 60 Hz/1800 Rpm
Three-Phase Only
Optional 208V motors are available in 3/4 hp to 20 hp models. Optional 230V and 460V motors are
available in 3/4 hp to 60 hp models. All motors have rigid base construction and ball bearings.
Energy Efficient TEFC, 60 Hz/1800 Rpm
Three-Phase Only
Optional 208V motors are available in 1 hp to 30 hp models. 230V and 460V motors are available
in 1 hp to 60 hp models. All motors have rigid base construction and ball bearings. Class B
insulation is on all motors.
wo-Speed/One Winding Motors, 60 Hz/1800/900 Rpm
Three-Phase Only
Optional 208V and 230V motors available on 1 hp to 20 hp models. Optional 460V motors are
available on 1 hp to 50 hp models. All motors have rigid base construction and ball bearings.
Class B insulation is on all motors.
Two-Speed/Two Winding Motors, 60 Hz/1800/1200 Rpm
Three-Phase Only
Optional 208V and 230V motors available on 1 hp to 20 hp models. Optional 460V motors are
available on 1 hp to 50 hp models. All motors have rigid base construction and ball bearings.
Class B insulation is on all motors.
Additional Options*
Inlet Hood and Birdscreen (DFOA only)
Hood constructed of 18-gauge galvanized steel. Birdscreen is 18-gauge galvanized steel with
one-inch square openings.
V-Bank Filter Section
Not required when a mixing box is specified. Constructed of 18-gauge galvanized steel.
Dampers and Mixing Box
Motorized Return Air Damper
This option provides a way to recirculate air, with the return air opening downstream of the burner.
This option includes return air damper, a two-position damper motor, linkage and damper switch.
It is not available with two-speed motors.
Motorized 75/25 Damper
This option provides a way for recirculating return air and allows building pressure to control the
amount of air that is recirculated. This option includes a return air damper, burner profile plate
damper, damper linkage, and modulating pressure controller. It is not available with two-speed
motors.
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Options
Mixing Box—Temperature Control
This option provides a way for recirculating return air and allows mixed air temperature to
determine the amount of OA/RA. This option includes mixing box with filter section, dampers,
damper actuator(s), and damper controls.
Mixing Box—Building Pressure Control
This option provides a way for recirculating return air and allows building pressure to control the
amount of air which is recirculated. This option includes a mixing box with filter section, dampers,
damper actuator(s), and damper controls (including a photohelic differential pressure gauge).
Mixing Box—Manual Control
This option provides a way for recirculating return air and using manual control to determine the
amount of OA/RA. This option includes a mixing box with filter section, dampers, damper
actuator(s), and a manual potentiometer.
Motorized Inlet Damper Option
This option provides a shutoff damper. On DFIA models, this option includes an outside air damper,
damper motor with built-in end switch, and linkage. It is not available with a mixing box.
On DFOA models, this option includes an outside air damper, two-position damper motor with a
built-in end switch, and linkage. It is not available with a mixing box.
Motorized Outlet Damper (DFOA)
This option provides a shut off damper and includes a discharge damper, two-position damper
motor with built-in end switch, and linkage.
Note: Based on unit design, some options can ship factory-installed or field-installed. Contact the
factory for verification.
Additional Factory Installed Options
Insulation
One-inch, 1-1/2 lb fiberglass insulation pin spotted to casing.
Internal Blower/Motor Isolation (DFOA only)
This option includes a steel frame for blower(s) and fan motor with spring type vibration isolators.
It is not available on vertical units.
Extended Grease Lines (DFOA only)
This option allows lubrication of fan bearings from the control side of the unit.
Controls Opposite from Standard
Applicable only to horizontal configurations. Locates controls, gas piping and fan motor on
opposite side of the unit.
115V Duplex Receptacle
This option includes a transformer and disconnect switch for the receptacle. Components are
mounted in the gas piping manifold, on DFOA units, and on the controls side of unit on DFIA
models.
UV Flame Sensor
The flame sensor checks to make sure the pilot flame has ignited before gas is sent to the main
burner. It operates by sensing the light of the pilot flame.
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Options
Clogged Filter Switch
This option includes a pressure sensing switch which senses the pressure drop across the filters.
When the pressure drop reaches the setpoint, the switch trips and lights the clogged filter light. It
is not required when City of Chicago controls are ordered.
Exhaust Fan Interlock
This option includes a pilot duty rated normally open contact on the main supply fan motor starter
that will close simultaneously with the starter (10 amp contacts).
Interlocking Relay
This option is energized by an auxiliary contact on the supply fan motor starter that can be used
for additional equipment that may need to run when the supply fan is running (12 amp contacts).
Painted Blower Section
Painted Burner Section
Painted Return Air Section
Painted Filter Section
Field Installed Accessories
Vibration Feet
Rubber-in-shear vibration isolators cannot be ordered with a roof curb – they ship unmounted.
DFIA models:
Vibration Feet—Filter Section
Vibration Feet—Blower Section
Vibration Feet—Burner Section
Vibration Feet—Return Air Section
DFOA models:
Vibration Feet—Basic Frame
Vibration Feet—Filter Section
Vibration Feet—Mixing Box
Vibration Hangers (DFIA models only)
Option includes rubber-in-shear vibration isolators, shipped unmounted.
Vibration Hangers—Blower Section
Vibration Hangers—Burner Section
Vibration Hangers—Return Air Section
Vibration Hangers—Filter Section
Seven-Day Time Clock
100 DBL Alarm Horn and Silencing Switch
To silence the alarm, the push button silencing switch is pushed.
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Options
Remote Control Station
On-Off Night Setback Thermostat
This option will shut unit off when space temperature is above setpoint. This is a 115V thermostat
with a temperature range of 50°F to 80°F. Option is normally used together with the seven-day
timeclock option.
High Gas Pressure Regulator
Specify inlet pressure at the unit. This is required for selection of the regulator.
Roof Curbs (DFOA models only)
Roof curbs are fabricated of 12-gauge galvanized steel. Curb gasket is provided. The 12-inch high
roof curbs ship disassembled.
Roof Curb For Basic Frame —. No return air
Roof Curb For Basic Frame —. With return air downstream of the burner
Roof Curb For Basic Frame —. With mixing box option
Discharge Louver—Horizontal Vanes Adjustable Side Inlet
Discharge Louver—Horzontal Vanes, Adjustable, Top Inlet (DFOA models only)
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Mechanical Specifications
DFIA Unit Casing
DFIA cabinets are designated for indoor use. Unit casing and accessories shall be fabricated from
heavy-gauge bright spangled galvanized steel suitably reinforced to insure rigidity. All casings
shall be air tight. Complete access shall be provided to all components. This includes the blower,
burner, and electrical components.
DFOA Unit Casing
Unit casing and accessories shall be fabricated from heavy-gauge galvanized steel suitably
reinforced to insure rigidity. The base of the unit shall be adaptable for curb mounting. All casings
shall be airtight and weatherproof. Roof panels shall be convex to prevent ponding, and designed
with roof eaves to prevent water from getting into wall panels. Complete access shall be provided
to all components through gasketed, hinged access doors. This includes the motor, blower, burner,
elctrical components and manifold sections.
Fans
Supply fans are double width, double inlet centrifugal type with FC fan wheels. Fans are tested in
accordance with AMCA 210.
The fan or fans are mounted on a steel shaft designed for a maximum operating speed not to
exceed 75 percent of its first critical speed.
Bearings are external heavy duty industrial prelubricated type. Bearing life is 100,000 hours.
Blowers are driven by a V-belt package sized with a capacity of 25 percent greater than the motor
horsepower.
Multiple belt applications will be matched sets.
Drives are adjustable pitched diameter type up through 7-1/2 hp, fixed on motors over 7-1/2 hp.
DFIA motors are externally mounted on an adjustable slide base. Belt guard shall be provided for
DFIA units.
Burner Section
The burner section contains a burner constructed of rust resistant cast iron bodies (which serve
as the gas manifold) drilled to discharge the fuel between diverging stainless steel mixing plates.
The entire burner assembly is mounted directly in the air stream being heated. The fresh air stream
passes through the mixing plates and mixes with the fuel as combustion air: thus all available heat
from the gaseous fuel is released directly into the air stream. Air velocities across the burner
assemblies are established by the use of profile plates.
The manifold is located outside of air stream and in DFOA models is also shielded from
atmospheric conditions by means of a protective compartment with hinged access. An observation
port shall be located to provide view of pilot and main flame.
Units are supplied with a wide range burner with a modulating turndown ratio of 25 to 1.
Adjustable profile plates are provided and sized to maintain the required velocity across the line
burner. The operation of the burner is programmed through the flame safeguard with timed
prepurge and flame sensing.
The burner assembly and gas manifold are completely prepiped and factory tested prior to
shipment.
Control Enclosure
Units are provided with a control compartment. All controls mounted within this compartment are
to be wired to a numbered terminal strip. All wiring is to be color coded and in accordance with
NEC. A circuit diagram of the approved electrical drawing is laminated to the inside of the control
cabinet door. All electrical components bear the UL label.
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Mechanical Specifications
FM for ETL Listed Units
For installations with ETL labeled units requiring Factory Mutual (FM) insurance. The standard
manifold meets FM requirements for ETL labeled units with 2475 MBh input or less. Units over
2475 MBh input will have motorized shut-off valves with visual indicator and high/low gas pressure
switch.
IRI for ETL Listed Units
For installations with ETL labeled units requiring Industrial Risk Insurers (IRI) insurance. The
standard manifold meets IRI requirements for all ETL labeled units
Block and Bleed Manifold
The block and bleed manifold consists of a manual main gas shutoff valve, a two motorized electric
main gas shut-off valves with visual indicator and proof of closure with electrical interlock, a
normally open vent valve, the Maxitrol modulating gas valve, a manual pilot gas shutoff valve, a
manual pilot gas pressure regulator, a pilot gas valve, an orifice needle valve, and a high/low gas
pressure switch. Can be used for installations with unlisted units requiring Industrial Risk Insurers
(IRI) insurance.
Modulating Room Temperature (MRT) Control System
The Modulating Room Temperature (MRT) control system controls the space temperature and
consists of setpoints for room temperature and both minimum and maximum discharge air
temperature and the unit DDC Controller with full BACnet® compatibility, a signal conditioner, a
modulator/regulator gas valve, an inlet air sensor, a discharge air sensor, and a remote control
panel. The remote control panel consists of a remote mounted 3 gang box cover with a manual
potentiometer to enable unit and adjust leaving air temperature setpoint, Fan On light, Burner On
light, and Cool On light. The features of the DDC Controller will also include timed freeze protection,
and inlet on-off ductstat.
Modulating Discharge Temperature (MDT) Control System
The Modulating Discharge Temperature (MDT) control system consists of the unit DDC Controller
with full BACnet® compatibility, a signal conditioner, a modulator/regulator gas valve, an inlet air
sensor, a discharge air sensor, and a remote control panel. The remote control panel consists of
a remote mounted 3 gang box cover with a manual potentiometer to enable unit and adjust leaving
air temperature setpoint, Fan On light, Burner On light, and Cool On light. The features of the DDC
Controller will also include timed freeze protection, and inlet on-off ductstat.
Modulating Room Temperature Pro (MRT Pro) Control System
The Modulating Room Temperature Pro (MRT Pro) control system controls the space temperature
and a unit DDC Controller with full BACnet® compatibility, a signal conditioner, a modulator/
regulator gas valve, an inlet air sensor, a discharge air sensor, and a space temperature thermostat
where room temperature can be sensed and set. In addition to allowing the user to control the room
setpoint temperature the room sensor also allows over ride timing and display of current heating
and cooling setpoints, fan status, and outside air temperature. The features of the DDC Controller
will also include timed freeze protection and an inlet on-off ductstat.
Modulating Room Temperature Expert (MRT Expert) Control System
The Modulating Room Temperature Expert (MRT Expert) control system controls the space
temperature and consists of setpoints for room temperature and both minimum and maximum
discharge air temperature and the unit DDC Controller with full BACnet® compatibility, a signal
conditioner, a modulator/regulator gas valve, an inlet air sensor, a discharge air sensor, and a space
temperature sensor and a BACview® controller for remote keyboard display. The features of the
DDC Controller will also include timed freeze protection, inlet on-off ductstat, electronic time clock
with normal, holiday, and override schedules, and on-off night setback thermostat.
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Mechanical Specifications
The display functions of the BACview keypad display with a minimum of four lines, sixteen
characters will include the following:
Table 38. Display functions of the BAVview keypad
Display Functions:
Critical Alarm Conditions:
BACview® Control Settings:
Return air temperature
Airflow switch failure
Heating setpoint
Outside air temperature
Unit on, fan off
Cooling setpoint
Discharge air temperature
Unit off, fan on
Economizer setpoint
Mixed air temperature
Low discharge temperature
Setback setpoint
Maximum allowable temperature rise
Safety circuit open
Freeze protection setpoint
Actual temperature rise
Burner jumped
Maximum discharge air temperature setpoint
Current percent of outside air
Minimum ventilation option and setpoint
Current building pressure
Time of day schedule selection and setpoints
Current damper input voltage
Current burner input voltage
Fan operating hours since last reset
Fan start cycle count since last reset
Burner operating hours since last reset
Burner start cycle count since last reset
Cooling interlock operating hours since last reset
Cooling interlock cycle count since last reset
Gas Train Approvals
The standard gas train consists of a main manual gas shutoff valve, a motorized electric main gas
valve, modulating gas valve, a manual pilot gas shutoff valve, a manual pilot gas pressure
regulator, a pilot gas valve, an orificed needle valve and auxiliary gas valve.
The Factory Mutual (FM) gas train consists of a manual main gas shutoff valve, a motorized electric
main gas valve, modulating gas valve, a manual pilot gas shut-off valve, a manual pilot gas
pressure regulator, a pilot gas valve, an orificed needle valve, a high/low gas pressure switch, a
manual auxiliary gas shutoff valve, and an auxiliary gas valve. (Optional)
Note: The standard gas train meets FM requirements for inputs under 2500 MBh for ETL listed
units.
The Industrial Risk Insurers (IRI) gas train consists of a manual main gas shutoff valve, a motorized
electric main gas valve, modulating gas valve, a manual pilot gas shutoff valve, a manual pilot gas
pressure regulator, a pilot gas valve, an orificed needle valve, a high/low gas pressure switch, a
manual auxiliary gas shutoff valve, a normally open vent valve, and an auxiliary gas valve.
(Optional)
Note: The standard gas train meets IRI requirements for ETL listed units.
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Literature Order Number
MUA-PRC007-EN
Date
November 2009
Supersedes
MUA-PRC007-EN (March 2007)
www.trane.com
For more information, contact your local Trane
office or e-mail us at [email protected]
Trane has a policy of continuous product and product data improvement and reserves the right to
change design and specifications without notice. Only qualified technicians should perform the
installation and servicing of equipment referred to in this literature.